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': "True about Boyle's apparatus: \nSelect and explain. \nA. Continuous flow machine, B. Liquid anesthetic vapours not used, C. Resistance very high, D. All", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Continuous flow machine', 'role': 'assistant'}]