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: Pathology
[{'content': 'Platelet is stored in - \nSelect and explain. \nA. 22 ± 2°C, B. - 4°C, C. - 2°C, D. - 20°C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Two methods of storage of platelets.\n1.\xa0\xa0\xa0 Liquid storage :\nBoth whole blood-derived and apheresis platelets concentrate may be stored for 5 days using following some principles.\n\nThe temperature must be 20- 24°C.\nStorage container must be constructed of a plastic material that allows adequate diffusion of oxygen to meet cells metabolic needs.\nPlatelets concentrates must be agitated during storage.\n\n2.\xa0\xa0 Frozen Storage :\nThe most widely used method for frozen storage employs controlled rate freezing (1°C/min); 5% DMSO as a cryoprotective agent.', 'role': 'assistant'}]