This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A patient presents with subarachnoid haemorrhage. NCCT reveals blood in the fouh ventricle. The bleeding is most likely to occur from an aneurysm of which of the following aeries \nSelect and explain. \nA. Anterior communicating aery, B. Basilar top region, C. AICA, D. PICA', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., PICA", 'role': 'assistant'}]