This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
MI are true about SALK vaccine except- 
Select and explain. 
A. OPV cannot be given as booster dose, B. Injections during epidemic can cause paralysis, C. Induces circulating antibody but no local immunity, D. Does not prevent multiplication of wild virus in gut
A: OPV cannot be given as booster dose
Answer: A: OPV cannot be given as booster dose 
Explanation: Ans. is 'a' i.e., OPV cannot be given as booster dose One or two doses of live vaccine (OPV) can be given safely as boosters after an initial course of immunization with inactivated vaccine.