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: 
Select and explain. 
A. Ketamine, B. Thiopentone, C. Suxamethoni, D. Diazepam
A: Ketamine
Answer: A: Ketamine 
Explanation: Ketamine