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Comments ...

 +3  (nbme22#50)

Just my two cents: Cytotrophoblast, primary stem villus, syncytiotrophoblast, and trophoblastic lacunae are all components of the developing placenta, which supplies the fetus in utero. These structures are all derived from the trophoblast, which is considered extra-embryonic tissue. "Hematopoietic stem cells" is the only answer choice that would indicate fetal parts were formed.


Subcomments ...

This is obviously a clinical trial. If you know you are getting a drug, then you are not blinded: it’s an open-label trial. There is no randomization as there is only a single treatment group.

charcot_bouchard  But they grouped them based on dosaged? +  
keyseph  I think the key thing here is that the participants were told what treatment they would be receiving. This is in line with an open-labeled clinical trial. Open-labeled clinical trials can still be randomized and do not need a control (as in this case). +1  

divalent cations interfere with the absorption (adsorbtion?) of Ciprofloxacin.

redvelvet  divalent cations interfere with the absorption of tetracyclines, not fluoroquinolones. anti-acids interfere with the absorption of fluoroquinolones. (like in this q, it's ca carbonate) +  
keyseph  According to SketchyPharm, divalent cations also interfere with the absorption of fluoroquinolones +