<prompt> The role of adjuvant in a DPT vaccine is :-Decrease hypersensitivityDecrease absorption of vaccineIncrease antigenicityIncrease the shelf life of a vaccine  <response>: Aluminum hydroxide phosphate is used as Adjuvantadsorbent in DPT vaccine ; Binds three components D,P,T together Increases immunogenicity Antigenicity - Thiomersal is added to DPT vaccine as a preservative. - Magnesium chloride is added to OPV vaccine: Provides stability. 