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': 'Ether was first used by: \nSelect and explain. \nA. Preistly, B. Moon, C. Wells, D. Simpson', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Moon', 'role': 'assistant'}]