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': 'Gas is filled as liquid in cylinder in – a) O2b) CO2 c) N2Od) Cyclopropanee) Halothane \nSelect and explain. \nA. bcd, B. d, C. ab, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oxygen, nitrogen, air and helium → Gaseous form\nNitrous oxide, carbon dioxide and cyclopropane → Liquid in equilibrium with saturated vapour.', 'role': 'assistant'}]