This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pathology
[{'content': 'CPD-A blood can be stored for? \nSelect and explain. \nA. 21 days, B. 30 days, C. 35 days, D. 42 days', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 35 days AdditiveShelf life of RBCAcid-citrate-dextrose (ACD)21 daysCitrate phosphate dextrose (CPD)21 daysCitrate phosphate dextrose-adenine (CPD-A)35 daysSaline-adenine-Glucose-Mannitol (SAG-M)42 days", 'role': 'assistant'}]