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
Vaccine can be stored at subcentre for: 
Select and explain. 
A. 2 days, B. 7 days, C. 15 days, D. 30 days
A: 2 days
Answer: A: 2 days 
Explanation: 2 days