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: Pathology
How long can blood be stored with CPD -A - 
Select and explain. 
A. 21 days, B. 28 days, C. 35 days, D. 42 days
C: 35 days
Answer: C: 35 days 
Explanation: None