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: Surgery
Premature filling of veins is a manifestation incerebral angiography of - 
Select and explain. 
A. Trauma, B. Brain tumour, C. Arteriovenous malformation, D. Arterial occlusion
C: Arteriovenous malformation
Answer: C: Arteriovenous malformation 
Explanation: In A.V. malformation there is rapid blood flow in veins.