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: Surgery
[{'content': 'The action of adrenaline is potentiated in the presence of all except: \nSelect and explain. \nA. Halothane, B. Ethyl chloride, C. Cyclopropane, D. Ether', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]