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': 'The age by which most of the normal babies know their gender is - \nSelect and explain. \nA. 1 year, B. 2 years, C. 3 years, D. 4 years', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 3 years", 'role': 'assistant'}]