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
Post marketing surveillance included in which phase of drug clinical trial? 
Select and explain. 
A. i, B. ii, C. iii, D. iv
D: iv
Answer: D: iv 
Explanation: 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