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
''Sleep apnoea '' is defined as a temporary pause in breathing during sleep lasting at least- 
Select and explain. 
A. 40 seconds, B. 30 seconds, C. 20 seconds, D. 10 seconds
D: 10 seconds
Answer: D: 10 seconds 
Explanation: 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