<prompt> True about obsessive compulsive disorder isare :Irresistible desire to do a thing repeatedlyPatient is conscious about the disorderDenial is the defense mechanism against O.C.DAll  <response>: A i.e. Irresistible desire to do a thing repeatedly; C i.e. Denial is the defence mechanism against OCP; B i.e. Patient is conscious about the disorder An idea intrudes into Conscious awareness repeatedly. 4 - Recognized as ones own idea but is Ego-alien Foreign to ones personality Q. - Recognized as irrational absurd insight is presentQ. - Patient tries to resist against but unable to do soQ. Failure to resist leads to marked distress. 