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 of the following i.v anaesthetic agent suppresses cortisol synthesis \nSelect and explain. \nA. Propofol, B. Ketamine, C. Etomidate, D. Thiopentone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Etomidate is known to cause adrenocortical suppression on long term infusion.', 'role': 'assistant'}]