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': "According to Mahler's theory, normal autistic phase is: \nSelect and explain. \nA. 5 - 36 months, B. 4 weeks - 4 years, C. 0 - 1 year, D. 2 - 3 years", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]