Given the task definition and input, reply with output. In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: What is the main diagnostic characteristic of a Bipolar I Disorder ?:
Options: <0> A disorder in which there is or has been an episode of mania. <1> A disorder in which there is or has been an episode of mania or hypomania. <2> A disorder in which there is or has been an episode of hypomania. <3> A disorder in which cycles of mania and psychosis alternate. <4> A disorder in which cycles of hypomania and depression alternate.
psychology