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': 'Earliest and most pathognomic feature of malginant hyperthermia is \nSelect and explain. \nA. Increased temperature, B. Increased end-tidal CO2, C. Increased heart rate, D. Increased respiratory rate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Increased CO2\xa0production is earliest sign of malignant hyperthermia.', 'role': 'assistant'}]