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': 'First sign of pubeal development in female is ? \nSelect and explain. \nA. Breast enlargement, B. Onset of mesturation, C. Enlargement of pubic hair, D. Maximum growth velocity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Breast enlargement", 'role': 'assistant'}]