This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
[{'content': 'Post marketing surveillance included in which phase of drug clinical trial? \nSelect and explain. \nA. i, B. ii, C. iii, D. iv', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Surveillance after marketing, i.e. after the drug is out in the market is a pa of Phase IV of clinical trials. It includes follow-up of patients taking the drug and adverse drug reaction (ADR) repoing as well as looking for newer treatment indications Ref: Park 24th edition', 'role': 'assistant'}]