This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
Premature filling of veins on cerebral angiography is a feature of 
Select and explain. 
A. Trauma, B. Brain tumour, C. Aeriovenous malformation, D. Aerial occlusion
C: Aeriovenous malformation
Answer: C: Aeriovenous malformation 
Explanation: .