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NBME 22 Answers
During a study of symptomatic proximal deep venous ...
Open-label clinical trial
there is no washout period and the order of drugs given isn't switched
This is a cohort study! (Since it involves splitting people into "groups"; group = cohort.) But the stem asks what "best describes" the design. So, yes, it's a cohort study but a more precise ("more specific") description is Open-label. In other words, "Open-label clinical trial" is a type of cohort study, and, in this case, "Open-label" is a more precise description of what is described in the stem.