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: Physiology
Alpha-wave in EEG is seen in 
Select and explain. 
A. Sleep, B. REM sleep, C. Awake state, D. Mental work
C: Awake state
Answer: C: Awake state 
Explanation: Stages of sleep and rhythm
-        Beta rhythm- Alert, awake, maximum concentration.
-        Alpha rhythm- Eyes closed, mind wandering, less attentiveness
-        Theta rhythm- Stage 1 NREM
-        Sleep spindles, K complex- Stage 2 NREM
-        Delta rhythm- Deep sleep (Stage 3 & 4 NREM)
-        Beta Rhythm and occasional alpha rhythm- REM
In alpha, rhythm patient is awake, not asleep.