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': 'Most sensory information reaches the cortex after first being processed by the: \nSelect and explain. \nA. Basal ganglia, B. Brain stem, C. Thalamus, D. Cerebellum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Thalamus > There is a major input from the anterolateral systems into the mesencephalic reticular formation. Thus, sensory input activates the reticular activating system, which in turn maintains the cortex in the alert state.', 'role': 'assistant'}]