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Comments ...

 +1  (nbme21#44)

The unnamed drug class in question are the cromoglycates, the two most notable being cromoyln and nedocromil

 +1  (nbme21#7)

This one is fairly logical if you remember that bacteria LOVE our iron. So much so, that our body came up with a way around it. When an infection is detected by the body, it makes like a doomsday prepper and batons down the hatches.

"All the iron into the bones, quick (^ferritin)! Hide it from the intruders! Get those iron delivery trucks (ferritin) off the road (blood)!

with decreased ferritin comes a decrease capacity for binding iron in the blood

cooldudeboy1  i like the way to remember acd but there is no bacterial etiology in Rheumatoid arthritis is there?
the_enigma28  The body recognises chronic inflammatory states as infections

Subcomments ...

submitted by nwinkelmann(111),

So I looked into this further too because I pretty much know nothing about the make up of semen. From the research I found, as as stated below by yo, fructose is the most important constituent of semen in terms or sperm function. Below is information I found to address the other answer choices.

Zinc deficiency (in serum), per FA, has been implicated in delayed wound healing, suppressed immunity, male hypogonadism, decreased adult hiar (axillary, facial, pubic), dysgeusia, anosmia, acromdermatitis enteropathica (defect in intestinal zinc absorption), and may predispose to alcoholic cirrhosis. FA didn't specify the levels in the semen, but per the below article, seminal zinc content was found to have nor correlation to sperm/semen activity/level/etc. I don't know if we're supposed to know that, but now I do, lol. https://www.ncbi.nlm.nih.gov/pubmed/3570537.

As hungrybox mentioned, selenlium is only mentioned once in FA as a treatment for tinea, so I looked into it further. Selenium is a content of semen, but levels vary so much that it serves no prognostic clincal relevance to infertility, per this article: https://www.ncbi.nlm.nih.gov/pubmed/3235210.

To rule out all of the answers (because I didn't really know anything about the quality fo semen), I found this "By t-statistics, there was no significant difference in the semen Na concentration among the different groups (7 groups total based on sperm count), indicating the insignificant role of Na in sperm motility.". https://www.ncbi.nlm.nih.gov/pubmed/721152.

Finally, I don't think the 5-alpha reductase enzyme is actually in semen, but I could be wrong. Either way, it wouldn't be abnormally elevated or low if the testosterone levels are normal.

bartolomoose  as per goljan, selenium is involved in glutathione peroxidase +  
chandlerbas  selenium has a role in glutathione peroxidase. excess selenium = garlic breath, hair loss, and nail changes, might see peripheral neuropathy. deficiency (pt on TPN) = dilated cardiomyopathy +  
chandlerbas  also zinc aids in sperm motility https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4773819/ thats why i chose zinc but whateverrr im over it +  

submitted by usmleuser007(135),

Confidence interval increases with decreased sample size.

usmleuser007  would require a a large sample size to see if there is a true difference +  
claptain  This question is bogus. CI does not always increase with decreased sample size or vice versa. Four readings with small variation would give a narrower CI than 10 readings with greater variation. The only thing you can be certain about by adding more samples is that the CI will most likely change, but which direction is uncertain. +1  
bartolomoose  Recall the formula for 95%ci Mean +/- 1.96* (SD/sqrt(samplesize)) +1