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': 'Curare notch seen in capnograph is due to \nSelect and explain. \nA. Carbon dioxide rebreathing, B. Bronchospasm, C. Spontaneous breathing, D. Valve malfunction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: With return of spontaneous ventilation, curare notch is seen in capnograph.', 'role': 'assistant'}]