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
To replenish the inventory, the Blood Banks routinely issue blood packets, which are close to the expiry date. Which of the following will be the closest to expiry date, according to the anticoagulant used and the method of storage of the packet: 
Select and explain. 
A. CPDA, 27 days, B. SAGM, 25 days with irradiation, C. SGAM, 35 days, D. ACD, 14 days
B: SAGM, 25 days with irradiation
Answer: B: SAGM, 25 days with irradiation 
Explanation: Following irradiation, the expiration of an RBC unit is 28 days from irradiation, or the original expiry date, whichever is earlier.