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': 'With respect to cardiac arrests occurring during anaesthesia – a) The most common preceding arrhythmia is bradycardiab) The most common cause is failure of ventilationc) Most occur during emergence from anaesthesiad) Most are considered unpreventable and untreatable \nSelect and explain. \nA. ac, B. a, C. ad, D. ab', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mast cardiac arrests are preceded by bradycardia suggesting that early identification and treatment may prevent complications.\nMost common cause is failure to provide adequate ventilation.\nMost of the cardiac arrests occur during induction or maintenance.', 'role': 'assistant'}]