This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Hemiplegia is most commonly due to Occlusion Of? \nSelect and explain. \nA. Middle cerebral aery, B. Basilar aery, C. Veebral aery, D. Anterior cerebral aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The MCA is the most common site for the occurrence of ischemic stroke. Contralateral hemiparesis and hemisensory loss of the face, upper and lower extremities is the most common presentation of MCA syndrome Ref Harrison20th edition pg 2234', 'role': 'assistant'}]