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: Radiology
Vessels catheterized on carotid angiography are: 
Select and explain. 
A. 2 external carotids and 2 veebral, B. 2 internal carotids and 2 veebral, C. 2 internal carotids and 1 veebral, D. 2 external carotids and 1 veebral
C: 2 internal carotids and 1 veebral
Answer: C: 2 internal carotids and 1 veebral 
Explanation: Ans. 2 internal carotids and 1 veebral