Perceptual misinterpretation of a real object is

Ans. is 'a' i.e. Illusion Both illusion and hallucination are perceptual disorders.In illusion there is misinterpretation of the actual stimulus whereas in hallucination perception occurs in the absence of any stimulus.Illusion -Misinterpretation of rope as snake.Hallucination - Able to see snake without any ropeDelusionIt is the disturbance in the content of thought.It is a belief based on incorrect inference about external reality and not consistent with patient's intelligence and sociocultural background.DeliriumIt is used as a general term for the quite cognitive impairment syndrome.Delirium is characterized by global impairment in consciousness, resulting in reduced level of alertness, attention, and perception of the environment.