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
DPT vaccine is stored at what temperature (in °C)? 
Select and explain. 
A. 4-Feb, B. 8-Apr, C. 0, D. -20
B: 8-Apr
Answer: B: 8-Apr 
Explanation: None