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: Dental
[{'content': 'First growth spurt takes place at what age \nSelect and explain. \nA. 1st year, B. 3rd year, C. 6th year, D. 9th year', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]