This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal hematopoiesis, Subject name: Pediatrics
[{'content': 'RBC Lifespan in preterm babies: \nSelect and explain. \nA. < 40 days, B. 40-60 days, C. 75-90 days, D. 100-120 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: LIFE SPAN OF RBC: - Pre term neonates - 40-60 days - Term neonates - 90 days - Older children/ Adults - 120 days', 'role': 'assistant'}]