This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Cirsoid aneurysms most commonly occur in which of the following vessels \nSelect and explain. \nA. Aoic arch, B. Splenic aery, C. Saphenous vein, D. Superficial temporal aery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cirsoid aneurysms are rare aerio-venous fistulas of the scalp. They are usually congenital in aetiology. In 90% of the patients, the superficial temporal aery is the main supply to the fistula ref - pubmed.com <a href=" <p>', 'role': 'assistant'}]