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
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:- 
Select and explain. 
A. Middle cerebral aery, B. Anterior communicating aery, C. Posterior cerebral aery, D. Basilar aery
C: Posterior cerebral aery
Answer: C: Posterior cerebral aery 
Explanation: 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