Task: Question Answering
Input (English): Question: In the DSM-IV classification, bipolar disorder is included within mood disorders. Is defined as: 
 Options:  <1> Syndrome that involves a set of symptoms such as sadness, guilt or loss of vital impulse. <2> Decrease in the ability to obtain pleasure, which leads the person to isolation and unproductivity. <3> Disorder characterized by the presence of episodes of euphoria or depression alternating with eutimia phase. <4> Alteration induced by substances that produce an expansive or irritable mood. <5> Affective state of a relatively autonomous and lasting character over time.
Output (English): 3