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': 'A 70 year old patient presents with dizziness and headache followed by left sided hemiparesis with right eye dilatation and ptosis. Most probable blood vessel damaged is:- \nSelect and explain. \nA. Middle cerebral aery, B. Anterior communicating aery, C. Posterior cerebral aery, D. Basilar aery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ipsilateral 3 CN palsy present along with ptosis & C/L Hemiparesis s/o Weber syndrome Cause: Lesion in Midbrain due to occlusion of P1 PCA Hemiplegia can occur due to occlusion in: MCA P1 PCA Basilar aery ant spinal aery', 'role': 'assistant'}]