This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'Which of the following intravenous anaesthetic agent interact with Tricyclic antidepressant. \nSelect and explain. \nA. Ketamine, B. Thiopentone, C. Propofol, D. Etomidate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ketamine can interact with the tricyclic antidepressant and can cause arrythmia thus if a patient is on tricyclic antidepressant we have to stop it 3 weeks prior to surgery.', 'role': 'assistant'}]