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': 'This pattern of capnograph is seen in \nSelect and explain. \nA. Spontaneous breathing, B. Endotracheal tube obstruction, C. Malignant hyperthermia, D. Unidirectional valve malfunction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The shark finn pattern capnograph is seen in endotracheal tube obstruction', 'role': 'assistant'}]