This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Vaccine which can be stored at - 10o c temperature - 
Select and explain. 
A. Polio, B. Measles, C. BCG, D. DPT
A: Polio
Answer: A: Polio 
Explanation: .cold chai temerature for storage of OPV, routine storage -2 to 8 degree long term storage --20 to -40 degree ref:park&;s textbook,ed 22,pg no 57