This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anaesthesia, Subject name: Anaesthesia
[{'content': 'What is the critical temperature of N2O \nSelect and explain. \nA. 118 degrees, B. -88 degrees, C. 26 degrees, D. 36.5 degrees', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In thermodynamics, a critical point (or critical state) is the endpoint of a phase equilibrium curve. The most prominent example is the liquid-vapor critical point, the endpoint of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by a critical temperature Tc and a critical pressure pc, phase boundaries vanish. critical temperature of N2O: 38.5degC', 'role': 'assistant'}]