OCD is characterised by

(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 one's own idea, impulse or image but is ego-alien (foreign to one's 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 one's 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 one's own idea, but somebody else's thought being forcibly inerted into one's mind.> An obsession is usually associated with a compulsion carcinoma form of behaviour which usually follows obsessions.