This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
Shelf life of gamma irradiated pRBC is 
Select and explain. 
A. 21 days, B. 28 days, C. 35 days, D. 42 days
B: 28 days
Answer: B: 28 days 
Explanation: Irradiation reduces RBC storage shelf life to not >28 days postirradiation depending on the time of irradiation relative to collection. Irradiation followed by refrigerator storage causes a higher concentration of in the product. To avoid wastage of RBC units, irradiation prior to issue is optimal. Ref baley and love 27 pg 17-18