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': 'All are sites of intracranial aneurysms except - \nSelect and explain. \nA. Post inferior cerebellar artery, B. Bifurcation of MCA, C. Junction of ICA & post. communicating artery, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]