Which is worse clinically, BHR or Atopy? Justify your answer. A clinical trial powered to show the efficacy of a drug in a specific disease population, with the goal of using these data as part of a marketing application, is usually considered a study O A. Phase 1 B. Phase 2 OC. Phase 3 OD. Phase 4 2 If a drug has never been tested in humans before and the goal of the initial study is to establish the safety and pharmacokinetics of a single ascending dose in healthy subjects, this study is considered a study.