This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
[{'content': 'Rapid cycling is associated with which illness: \nSelect and explain. \nA. Substance abuse, B. Schizophrenia, C. Bipolar Disorder, D. Panic disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Bipolar disorderBipolar disorder involves extremes of both high and low moods and a range of other symptoms. In rapid cycling, moods change quickly, with at least 4 distinct mood episodes per year.', 'role': 'assistant'}]