Most heat sensitive vaccine: (A) BCG, (B) TT, (C) OPV, (D) Small pox
Answer is C. According to heat sensitivity of vaccines ,they are arranged in to 6 groups ie Group A to Group F Most heat sensitive are in group A and least in Group F OPV is included in group A Reference; Park&;s Textbook of Preventive and Social medicine; 24th edition; Page no. 114