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: Unknown
[{'content': 'Regarding involvement of structures in Weber syndrome all true except: \nSelect and explain. \nA. Oculomotor nerve roots, B. Cerebellar peduncles, C. Corticobulbar tracts, D. Cortispinal tract', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref. API Textbook of Medicine. Pg. 533\n\xa0\nWeber's Syndrome constitutes an ipsilateral third nerve paralysis with a contralateral hemiplegia.\n\nIt is due to a lesion in one half of the midbrain e.g. as a result of occlusion of the paramedian branches of the basilar artery.\nIf there is a localised lesion in the region of the red nucleus, then there is paralysis of upward gaze.", 'role': 'assistant'}]