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': 'Flat capnogram found in A/E – \nSelect and explain. \nA. Disconnection of anesthetic tubing, B. Accidental extubation, C. Mechanical ventilation failure, D. Bronchospasm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All the four options given in the question can cause flat Capnography. But, bronchospasm is the single best answer here as only severe bronchospasm (causing complete respiratory obstruction) can cause a flat capnograph. However, bronchoconstriction is usually partial which causes a steep plateau in capnograph (not flat capnograph).\nA flat capnograph is seen in accidental extubation, equipment failure, disconnection (dissociation) of a tube, total occlusion, mechanical ventilation failure, cardiac arrest, severe bronchospasm completely obstructing the airway and complete occlusion of pulmonary circulation.', 'role': 'assistant'}]