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': 'In adult male person presents with drowsiness, veigo & unconsciousness which aery is involved \nSelect and explain. \nA. Anterior cerebral aery, B. Middle cerebral aery, C. Posterior cerebral aery, D. Anterior choroidal aery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Aneurysms of the posterior cerebral aery (PCA) represent approximately 1% of all intracranial aneurysms (1-4). The surgical approach and dissection of the PCA is technically challenging owing to the complexity of its perforating branches and their intimate relationship with the cranial nerves and upper brain stem Of the five giant serpentine aneurysms of the PCA, four presented with a constellation of symptoms related primarily to the associated mass effect on the adjacent temporal lobe and optic tract, ie, seizures, memory loss, and incongruous hemianopsia Ref Harrison20th edition pg 2345', 'role': 'assistant'}]