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: Physiology
At what temperature blood is stored: 
Select and explain. 
A. —4°C, B. 4°C, C. 6°C, D. 8°C
B: 4°C
Answer: B: 4°C 
Explanation: None