system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Hallucinations, true is ?
assistant
The correct answer is  Ans. is 'c' i.e., There is no external stimulus Characteristics of Hallucinations :? Absence of corresponding external perceptual stimuli. Vividness, force and reality value of a normal perception. The experience occurs spontaneously It cannot be produced or terminated at will by subject (not in conscious or voluntary control). Perceived as being in external objective space. Have relative permancy (i.e. remain constant and unchanged). Hallucinations are usually experienced alongside and simultaneously with normal perception.