Instructions: 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.
Input: Question: What alteration does a person suffer that believes that their thoughts are not theirs but have been introduced into the mind by an external and irresistible force ?:
Options: <0> Obsessive idea <1> Delusional idea of denial. <2> Fugue of ideas. <3> Delirium to be controlled. <4> Echo of thought.
Output:
psychology