This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant facts in Immunization, Newer Vaccines, Subject name: Social & Preventive Medicine
The role of adjuvant in a DPT vaccine is :- 
Select and explain. 
A. Decrease hypersensitivity, B. Decrease absorption of vaccine, C. Increase antigenicity, D. Increase the shelf life of a vaccine
C: Increase antigenicity
Answer: C: Increase antigenicity 
Explanation: Aluminum hydroxide / phosphate is used as Adjuvant/adsorbent 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.