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
Anaesthetic agent associated with hallucination is: 
Select and explain. 
A. Ketamine, B. Halothane, C. Ether, D. Cyclopropane
A: Ketamine
Answer: A: Ketamine 
Explanation: Ketamine