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': 'Three years back a woman suffered during an eahquake and she was successfully saved. After recovery she has nightmares about the episode and she also gets up in the night and feels terrified. The most probable diagnosis is : \nSelect and explain. \nA. Major depression, B. Post-traumatic stress disorder, C. Mania, D. Schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Post traumatic stress disorder', 'role': 'assistant'}]