Vaccine with maximum efficacy is -
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.
OPV
Measles
BCG
TT