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
The postmarketing trial comes under 
Select and explain. 
A. Phase 1 clinical trial, B. Preclinical trial, C. Phase 3 clinical trial, D. Phase 4 clinical trial
D: Phase 4 clinical trial
Answer: D: Phase 4 clinical trial 
Explanation: There are 4 phases of a clinical trial. Once the drug is released into market pharmacovigilance is done - comes under phase 4 of drug trial to asses the safety, cost effectiveness of the drug once marketed Ref: K.D.Tripati.7th ed. Pg 82-83