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: Pharmacology
Hallucinations are seen after ............... anaesthesia : 
Select and explain. 
A. Ketamine, B. Thiopentone, C. Fentanyl, D. Nitrous oxide
A: Ketamine
Answer: A: Ketamine 
Explanation: None