This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': "''Sleep apnoea '' is defined as a temporary pause in breathing during sleep lasting at least- \nSelect and explain. \nA. 40 seconds, B. 30 seconds, C. 20 seconds, D. 10 seconds", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sleep OSAHS also may be diagnosed in the absence of symptoms if the AHI is above 15. Each episode of apnea or hypopnea represents a reduction in breathing for at least 10 sec Ref Harrison 19th edition pg 1723', 'role': 'assistant'}]