<prompt> Strain used for chickenpox vaccine:Edmonston Zagreb strainOka strainDanish 131RA 273 strain  <response>: Ans. b Oka strain. Ref. Park PSM 22ndpg. 137VACCINESTRAIN USEDMeaslesHDC-Edmonston Zagreb strainBCGDanish 131Chicken pox live attenuatedOka strainOPVSabin strainIPVSalk strainRubellaRA 273 strain 