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 40 year old gentleman is brought to the emergency services with a history of acute severe headache followed by sudden loss of consciousness. The most likely source of bleeding is: \nSelect and explain. \nA. Middle meningeal artery, B. Bridging veins, C. Charcot–Bouchard aneurysms of the lenticulostriate branches of the middle cerebral artery, D. Rupture of a saccular aneurysm at junction of anterior cerebral artery and anterior communicating artery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]