This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cystic fibrosis & Sleep apnea, Subject name: Medicine
The Epwoh scale is used for assessing? 
Select and explain. 
A. Body mass index, B. Vital capacity in post-operative patients, C. Sleep apnea, D. Risk of embolism in perioperative patient
C: Sleep apnea
Answer: C: Sleep apnea 
Explanation: The Epwoh sleepiness scale has been validated primarily in obstructive sleep apnea, though it has also shown success in detecting narcolepsy and idiopathic hypersomnia. It is used to measure excessive daytime sleepiness and is repeated after the administration of treatment (e.g. CPAP) to document improvement of symptoms. Fill up a questionnaire and if score is >8 medical advices is recommended and a polysomnography should be done. In narcolepsy, the Epwoh sleepiness scale has both a high specificity (100%) and sensitivity (93.5%).