Clinical trials on human beings are strictly regulated by good clinical practices to assure that the trials are well-conducted to prove the safety and efficacy profile of the new medication. Clinical trials are divided into 4 phases. Phase 1 studies the safety of the new medication. Phase 2 studies the efficacy of the medication. Phase 3 tries to corroborate the efficacy in multicentric studies, The phase 4 is also called the post-marketing monitoring phase.
The correct answer is A.
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