This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'What is SMR staging based on the following findings in a female? \nSelect and explain. \nA. 2, B. 3, C. 4, D. 5', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. 3Developed breast and areola, but no contour separation, no secondary mound; dark pubic hairs present, but not curled; These are features of Tanner's stage 3.", 'role': 'assistant'}]