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 be 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: Blood can stored with CPD -A → up to 35 days
Blood can stored with CPD → 21 days