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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).
Yeah, bad question IMO. Open-labeled trial can also be randomized... Since they didn't tell us how participants were selected for each group perhaps that's why C is better than D?
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)
According to SketchyPharm, divalent cations also interfere with the absorption of fluoroquinolones
Calcium carbonate is an antacid but it has Calcium in it....which is a divalent cation