This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stroke and TIA, Subject name: Medicine
[{'content': 'Hemiplegia is most often caused by thrombosis of: \nSelect and explain. \nA. Anterior cerebral aery, B. Middle cerebral aery, C. Posterior cerebral aery, D. Basilar aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hemiplegia occurs most commonly due to occlusion of middle cerebral aery. Paraplegia occurs due to occlusion of anterior cerebral aery. Posterior cerebral aery occlusion leads to Homonymous visual-field cut, usually a complete hemianopia Macular or central field sparing can occur if the occipital pole remains intact through blood supply from a branch of the middle cerebral aery.', 'role': 'assistant'}]