This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Angiography, Subject name: Radiology
[{'content': 'Feeding Aery and a well defined nidus is characteristic of? \nSelect and explain. \nA. True AV malformation, B. Venous angioma, C. Cavernous angioma, D. Hemangioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Feeding Aery and Nidus is seen in True AV malformation Popcorn Appearance in Cavernous Angioma Medusa Head /Spoke wheel pattern in Venous Angioma', 'role': 'assistant'}]