This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous General Anesthesia, Subject name: Anaesthesia
[{'content': 'Dissociative anaesthesia is produced by - \nSelect and explain. \nA. Ketamine, B. Etomidate, C. Propofol, D. Thiopentone', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ketamine o Dissociative anaesthesia is characterized by profound analgesia, immobility, amnesia with light sleep and feeling of dissociation from once own body and the surroundings Cataleptic state,o Ketamine (phencyclidine) induces dissociative anaesthesia.", 'role': 'assistant'}]