This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anaesthesia
Dissociative anaesthesia is produced by 
Select and explain. 
A. Ketamine, B. Etomidate, C. Propofol, D. Thiopentone
A: Ketamine
Answer: A: Ketamine 
Explanation: Dissociative anaesthesia is characterized by profound analgesia, immobility, amnesia with light sleep and feeling of dissociation from once own body and the surroundings - Cataleptic stateKetamine (phencyclidine) induces dissociative anaesthesia.(Refer: stoelting's pharmacology and physiology in anaesthetic practice, 5th edition, pg no.294)