This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
Modafinil is approved by FDA for treatment of all except: 
Select and explain. 
A. Obstructive sleep apnea syndrome (OSAS), B. Shift work syndrome (SWS), C. Narcolepsy, D. Lethargy in depression
D: Lethargy in depression
Answer: D: Lethargy in depression 
Explanation: Modafinil is FDA approved for: Narcolepsy Shift work sleep disorder As an adjunct in obstructive sleep apnea.