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': 'All of the following are Bipolar disorders except \nSelect and explain. \nA. Mania + Depression, B. Hypomania + Depression, C. Mania alone, D. Depression alone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Even a single episode of Mania alone is considered as bipolar disorder.\nHence option 4\xa0is false.', 'role': 'assistant'}]