This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neural Tracts, Subject name: Physiology
[{'content': 'Arousal response in mediated by: \nSelect and explain. \nA. Dorsal column, B. Reticulo activating system, C. Spinothalamic tract, D. Vestibule cerebellar tract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Reticulo activating system RAS (Reticulo-Activating system):a. RAS fibers convey impulses upwards to the thalamus and cerebral cortex.b. RAS fibers are multisynaptic path beginning at the medulla and pass upward via pons and mid brain to reach the thalamus.c. Function of RAS ~ when the RAS is stimulated, there is wakefulness and alertness of the subject and the subject becomes fully conscious.', 'role': 'assistant'}]