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 – a) Continuous flow machineb) Liquid anesthetic vapours not usedc) Resistance very highd) Resistance low \nSelect and explain. \nA. b, B. c, C. ad, D. ab", 'role': 'user'}, {'content': "Answer: C \nExplanation: Boyle's machine operates on the continuous flow principle, where gas flows all the time during inspiration and expiration.\nVaporizer contain a volatile inhalation anesthetic agent in liquid form which is vaporized before being mixed with gaseous mixture.\nResistance to intermittent gas flow should be very low.", 'role': 'assistant'}]