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
[{'content': 'Shelf life of gamma irradiated pRBC is \nSelect and explain. \nA. 21 days, B. 28 days, C. 35 days, D. 42 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]