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: Pediatrics
[{'content': 'Exchange blood transfusion what is used ? \nSelect and explain. \nA. Whole blood, B. EPP, C. Serum, D. Pack cell', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Whole blood", 'role': 'assistant'}]