This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
[{'content': 'Phase 4 clinical trial also called as \nSelect and explain. \nA. Therapeutic confirmation, B. Post marketing surveillance, C. Therapeutic exploration and dose ranging, D. Human pharmacology and safety', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Phase IV: Postmarketing surveillance/ studies After the drug has been marketed for general use, practicing physicians are identified through whom data are collected on a structured proforma about the efficacy, acceptability and adverse effects of the drug. Uncommon/idiosyncratic adverse effects, or those that occur only after long-term use and unsuspected drug interactions are detected at this stage. Ref:- kd tripathi; pg num:-80', 'role': 'assistant'}]