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 regarding anaesthesia apparatus – \nSelect and explain. \nA. Rotameter reading may not get affected by dirt inside the tube, B. Rotameter reading may not get affected by static electricity, C. The Boyle machine is an intermittent flow device, D. An oxygen failure safety device operate even in the absences of nitrous oxide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Oxygen failure safety device operates to detect oxygen supply pressure (not N2O pressure). So, if O2 supply pressure is low it operates to interrupt the flow of N2O.', 'role': 'assistant'}]