<prompt> Vaccine with maximum efficacy is -OPVMeaslesBCGTT  <response>: Ans. is b i.e. Measles Measles and tetanus have been explained in above explanation. BCG has variable efficiacy of 80 OPV requires multiple doses three. OPV has 90 efficacy in industrialized countries and 72-98 in hot climates when cold chain is properly maintained. 