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.
Q: Question: In the DSM-IV classification, bipolar disorder is included within mood disorders. Is defined as:
Options: <0> Syndrome that involves a set of symptoms such as sadness, guilt or loss of vital impulse. <1> Decrease in the ability to obtain pleasure, which leads the person to isolation and unproductivity. <2> Disorder characterized by the presence of episodes of euphoria or depression alternating with eutimia phase. <3> Alteration induced by substances that produce an expansive or irritable mood. <4> Affective state of a relatively autonomous and lasting character over time.
A:
nursery