<prompt> Which of the following present with loss of consciousness:SchizophreniaDementiaManiaOrganic brain syndrome  <response>: Ans. d Organic brain syndromeORGANIC BRAIN SYNDROME It is also known as organic brain disease which is decreased mental function due to a medical disease, other than a psychiatric illness. Cognitive or higher mental functions i.e. consciousness, orientation abstract thinking are impaired in organic brain syndrome. 