This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
EEG with eyes closed, in normal alert adult predominantly shows 
Select and explain. 
A. Alpha waves, B. Beta waves, C. Theta waves, D. Delta waves
A: Alpha waves
Answer: A: Alpha waves 
Explanation: (A) Alpha waves # Alpha waves are neural oscillations in the frequency range of 7.5-12.5 Hz arising from synchronous and coherent (in phase or constructive) electrical activity of thalamic pacemaker cells in humans.> Alpha waves are one type of brain waves detected either by electro- encephalography (EEG) and predominantly originate from the occipital lobe during wakeful relaxation with closed eyes.