This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'What are the EEG waves record for parietooccipital region with subject awake & eye closed? \nSelect and explain. \nA. Alpha waves, B. Beta waves, C. Delta waves, D. Theta waves', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In adult humans who are awake but at rest with the mind wandering and eyes closed the most prominent component of EEG is a fairly regular pattern of waves at a frequency of 8-13 Hz and amplitude of 50-100uV, this pattern is the alpha rhythm. Ref: Ganong&;s review of medical physiology; 23rd edition; pg:233', 'role': 'assistant'}]