<prompt> OCD is characterised byObsession of contamination rareBuspirone is used to augment the therapyPatient readily discussses the symptomsOnset late adulthood  <response>: D Onset late adulthood Obsessive-Compulsive Disorder: An obsession is defined as an idea, impulse or image which intrudes into conscious awareness repeatedly. It is recognized as ones own idea, impulse or image but is ego-alien foreign to ones personality. It is recognized as irrationl and absurd insight is present Patient tries to resist against it but is unable to Failure to resist leads to marked distress. Differentiation has to be made from delusion and thought insertion. A delusion is recognized as ones own idea but is not recognized as ego-alien. It is strongly believed, hence it is never thought to be irrational and is never resisted. Thought inertion is not thought of as ones own idea, but somebody elses thought being forcibly inerted into ones mind. An obsession is usually associated with a compulsion carcinoma form of behaviour which usually follows obsessions. 