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
[{'content': 'Which drug of anaesthetics causes hallucination – \nSelect and explain. \nA. Ketamine, B. Trilene, C. Halothane, D. Trichloroethylene', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ketamine causes emergence reaction (emergence delirium) and hallucination.', 'role': 'assistant'}]