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': 'Most common site for berry aneurysm rupture \nSelect and explain. \nA. Anterior circulation of brai, B. Posterior circulation of brain, C. Ascending aoa, D. Descending aoa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Anterior circulation of brain The most common sites in descending order of frequency are - Li Proximal poion of anterior communicating aery (at the junction of anterior communicating aery with cerebral aery) At the origin of the posterior communicating aery from the stem of the internal carotid aery. At the first major bifurcation of middle cerebral aery. At the bifurcation of internal carotid into middle and anterior cerebral aeries. Veibrobasilar bifurcation (3%)", 'role': 'assistant'}]