<prompt> Following are the major symptoms of obsessive compulsive disorders ?ContaminationPathological doubtsIntrusive thoughtsAll the above  <response>: Ans. isdi.e., AII the aboveRl Kaplan Saddocks tre p. 605OCD has four major symptom patterns :-Contamination : -Contamination is the most common pattern of an obsession followed by washing washerPathological doubts : -Doubts is the second most common pattern of an obsession, followed by a compulsive checking checkers.Intrusive thoughts Pure obsessions : -In this third most common pattern, there are intrusive obsessional thoughts without a compulsion.Such obsessions are usually r4re titious thoughts of a sexual or aggressive act that is reprehensible to the patient.Symmetry: -This is the fouh most common pattern in which there is an obsession for symmetry or precision, which can lead to compulsion of slowness.Patients can literally take hours to shave their faces or to eat a meal. 