This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
[{'content': 'Capnography is used for assessment of \nSelect and explain. \nA. Oxygen saturation of blood, B. Amount of CO2 transpoed in blood, C. Ventilation of lung after intubation, D. Myocardial perfusion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Capnography is the method of determining CO2 levels in exhaled gases (PACO2) but NOT blood.It is the ideal confirmatory method of endotracheal intubation(VENTILATION OF LUNG AFTER INTUBATION) Aeral blood gas analysis is used to measure CO2 levels in Blood (PaCO2) Pulse oxymetry is used to measure oxygen saturation of blood and hea rate.', 'role': 'assistant'}]