Task: Question Answering
Input (English): 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:  <1> Obsessive idea <2> Delusional idea of ​​denial. <3> Fugue of ideas. <4> Delirium to be controlled. <5> Echo of thought.
Output (English): 4