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: Psychiatry
[{'content': 'Delayed onset PTSD is diagnosed if symptoms appear after ________ months. \nSelect and explain. \nA. 1 months, B. 3 months, C. 6 months, D. 1 year', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]