This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Storage of vaccines, Subject name: Pediatrics
Which of the following vaccines is most sensitive to heat? 
Select and explain. 
A. Oral Polio vaccine, B. BCG vaccine, C. DPT vaccine, D. Measles vaccine
A: Oral Polio vaccine
Answer: A: Oral Polio vaccine 
Explanation: - Heat sensitive vaccines: OPV - most heat sensitive. Hence stored in freezer Reconstituted BCG Measles vaccine ***Note: For heat sensitivity: Reconstituted BCG > OPV > BCG -Light sensitive vaccines: Measles vaccine BCG Rota JE vaccine -Freeze sensitive vaccines: Hep B Pentavalent TT DPT vaccine