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
What are the EEG waves recorded for parieto occipital region with subject awake an eyes closed: 
Select and explain. 
A. Alpha waves, B. Beta waves, C. Theta waves, D. Delta waves
A: Alpha waves
Answer: A: Alpha waves 
Explanation: A ref: Physio Ganong, 21 st/e p. 197