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': "Weber's syndrome occurs due to lesions in the \nSelect and explain. \nA. Pons, B. Midbrain, C. Medulla oblongata, D. Cerebellum", 'role': 'user'}, {'content': "Answer: B \nExplanation: Weber's syndrome (superior alternating hemiplegia) is a form of stroke characterized by the presence of an ipsilateral oculomotor nerve palsy and contralateral hemiparesis or hemiplegia. It is caused by midbrain infarction as a result of occlusion of the paramedian branches of the posterior cerebral aery or of basilar bifurcation perforating aeries. Ref: guyton and hall textbook of medical physiology 12 edition page number: 761,762763", 'role': 'assistant'}]