This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
a-rhythm is seen in: 
Select and explain. 
A. Sleep with eyes closed with mind wandering, B. Mental activity, C. Awake with eyes open, D. REM sleep
C: Awake with eyes open
Answer: C: Awake with eyes open 
Explanation: C i.e. Awake with eyes open