This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Which among the following is live attenuated vaccine 
Select and explain. 
A. OPV, B. DT, C. TAB, D. TT
A: OPV
Answer: A: OPV 
Explanation: Ans) a (OPV) Ret Park 20th ed p 180Another simple question regarding immunization.OPV is a live attenuated vaccine. DT and TT are toxoidTAB is a heat killed Typhoid bacillus vaccine