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
[{'content': 'Arousal response is mediated by \nSelect and explain. \nA. Dorsal column, B. Reticular activating system, C. Spinothalamic tract, D. Vestibulo cerebellar tract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Arousal response in cerebral cortex is activated by stimulation of Reticular activating system.', 'role': 'assistant'}]