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: Surgery
How long can blood stored with CPD - A ? 
Select and explain. 
A. 12 days, B. 21 days, C. 28 days, D. 48 days
C: 28 days
Answer: C: 28 days 
Explanation: Ans. is 'c' i.e., 28 days Blood can stored with CPD -A --> upto 35 days Blood can stored with CPD ---> 21 days