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
[{'content': 'Definition of hallucination - \nSelect and explain. \nA. Perception without stimulus, B. Alteration of perception of a real stimulus, C. Change in Intesitity of a real stimulus, D. Misinterpretation of a real stimulus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Perception witout stimulus o Disorder of perception may be : -Altered perception : - There is alteration of preception of a real external stimulus. It may be : -Sensory distortion : - There is change in the intensity of a real external stimulus. For example micropsia (perceiving a real object smaller than its normal size) and hyperacusis (perceiving sounds as abnormally loud).Illusion : - There is misinterpretation of a real external stimulus. For example mistaking a stick for snake.False perception : - There is an internal perception without a real external stimulus, e.g., Hallucination and pseudo-hallucination", 'role': 'assistant'}]