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': 'Umbilical cord becomes black in ? \nSelect and explain. \nA. 2-3 days, B. 5-7 days, C. 7-10 days, D. 10-14 days', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 2-3 daysThe cord becomes brownish black within 2 or 3 days after bih.It falls off in about 10-14 days.", 'role': 'assistant'}]