<prompt> True about DPT vaccine ?95 EfficacyPrevent development of carrierPrevent development of DiphtheriaStored at -4deg C  <response>: Ans. is b i.e., Prevent development of carrier Diphtheria toxoid in DPT prevents development of disease by inducing antibody formation against diphtheria toxin exotoxin which is responsible for disease. But, it does not prevent carrier state as antibodies are not produced against organism and it can reside in nasopharynx. 