This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Adjuvant used in DPT vaccine is: 
Select and explain. 
A. Aluminium phosphate, B. Silica, C. Magnesium hydroxide, D. Manganese hydroxide
A: Aluminium phosphate
Answer: A: Aluminium phosphate 
Explanation: Adjuvant used in DPT vaccine is aluminium phosphate or hydroxide. Use of adjuvant increases immunological effectiveness of DPT vaccine. Ref: Park 21st edition, page 151.