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': 'End–tidal CO2 is increased to maximum level in – \nSelect and explain. \nA. Pul. embolism, B. Malignant hyperthermia, C. Extubation, D. Blockage of secretion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The unanticipated doubling or tripling of end tidal CO2 is the earliest & most sensitive indicator of malignant hyperthermia. The earliest signs seen during anesthesia are masseter muscle rigidity (MMR), tachycardia, & hypercarbia.', 'role': 'assistant'}]