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': 'Fluoride content is least – \nSelect and explain. \nA. Methoxyflurane, B. Enflurane, C. Isoflurane, D. Sevoflurane', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amongst the given options isoflurane produces minimum fluoride.\n\nMethoxyflurane →\xa050 m\nSevoflurane →\xa030 - 50 m\nEnflurane →\xa020 - 25 in\nIsoflurane →\xa04 - 8 m\nHalothane →\xa0Only in anaerobic conditions\nDesflurane →\xa0Zero', 'role': 'assistant'}]