This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms & Signs , Subject name: Psychiatry
Hallucination and illusion are disturbances in 
Select and explain. 
A. Thought, B. Perception, C. Sensation, D. Mood
B: Perception
Answer: B: Perception 
Explanation: Ans. b (Perception ) (Ref. Kaplan & Sadock's Synopsis of Psychiatry, 10th ed., p. 278)Hallucination and illusion are disturbance in perception.Schizophrenia is a heterogeneous syndrome characterized by perturbations of language, perception, thinking, social activity, affect, and volition.Key Symptoms Of Depersonalization# Depersonalization: Believe that he/she is not real, "Out-of-Body Experience"# Derealization: Believe that the world is not real# Perception Distortion of the environment during episodes of Depersonalization# Jamais vu (a sense of familiar things being strange)# Deja vu (a sense of unfamiliar things being familiar)