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 pubertal 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: None', 'role': 'assistant'}]