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
A person with eyes closed and mind wandering will have the following wave in EEG 
Select and explain. 
A. Beta waves, B. Alpha wave, C. Delta waves, D. Theta waves
B: Alpha wave
Answer: B: Alpha wave 
Explanation: B i.e. Alpha wave