This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetric Anesthesia, Subject name: Anaesthesia
[{'content': 'Which inhalational agent is best uterine relaxant? \nSelect and explain. \nA. Halo thane, B. Isoflurane, C. Sevofiurane, D. Desflurane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) HalothaneREF: Synopsis of Anaesthesia p.168Best uterine relaxant is halothane followed by ether', 'role': 'assistant'}]