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
[{'content': 'Packed red cells are stored in: \nSelect and explain. \nA. SAG-M solution, B. PCR-F solution, C. MED-R solution, D. DAM-P solution', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Packed cells are stored in a SAG-M solution (saline–adenine–glucose–mannitol) to increase their shelf-life to 5 weeks at 2–6 deg C. (Older storage regimens included storage in CPD – citrate–phosphate–dextrose solutions – giving cells a shelf-life of 2–3 weeks).', 'role': 'assistant'}]