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': 'Calcification of permanent first molar usually \nbegins in the: \nSelect and explain. \nA. Third month of intrauterine life, B. In the sixth month of intrauterine life, C. At birth, D. In the third month of extra uterine life', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]