This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood: RBCs, Anemia, and Polycythemia, Subject name: Physiology
[{'content': 'Life span of neonatal RBC - \nSelect and explain. \nA. 60-90 days, B. 90-120 days, C. 120-150 days, D. 150-200 days', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 60-90 days o Life span of neonatal RBCs- 60-90 days,o Life span of RBCs of premature newborn- 30-50 days.o Life span of RBCs in older children- 100-120 days.o Life span of adult RBCs- 120 days.", 'role': 'assistant'}]