This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia for Neurologic & Psychiatric Diseases, Subject name: Anaesthesia
Anaesthetic agent causing hallucination is 
Select and explain. 
A. Ketamine, B. Ether, C. Nitrous Oxide, D. Cyclopropane
A: Ketamine
Answer: A: Ketamine 
Explanation: Ans. is 'a' i.e. Ketamine Ketamine is an analogue of phencyclidine and therefore it causes hallucinations.Facts you must always remember about Ketamine.It causes Dissociative Anaesthesia *It causes sympathetic stimulation which leads to* Cardiac stimulation-increase O2 demand** Bronchodilation-it is anaesthetic of choice for Bronchial Asthma* Increase all pressure*-B.P. I.C.T. I.O.P.* It causes muscular rigidity* It increases salivation so Atropine is always given with it*