This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunization, Subject name: Pediatrics
Which vaccine cannot be used in adults? 
Select and explain. 
A. Hep A, B. MMR, C. DPT, D. Pneumococcal
C: DPT
Answer: C: DPT 
Explanation: c. DPT(Ref: IAP Guidebook on Immunization 2013-14, p 387)Tdap vaccine (single dose) is recommended in adolescents / adults & not DTPTdap contains lesser amount of Diphtheria & Pertussis antigens, compared to DTP