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
Rapid cycling is associated with which illness: 
Select and explain. 
A. Substance abuse, B. Schizophrenia, C. Bipolar Disorder, D. Panic disorder
C: Bipolar Disorder
Answer: C: Bipolar Disorder 
Explanation: 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.