This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Dissociative anaesthesia is produced by - (PGI 99) 
Select and explain. 
A. Ketamine, B. Etomidate, C. Propofol, D. Thiopentone
A: Ketamine
Answer: A: Ketamine 
Explanation: Ans. is 'a' i.e., Ketamine 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. Ketamine (phencyclidine) induces dissociative anaesthesia.