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
Allen test detects insufficiency of which artery 
Select and explain. 
A. Aorta, B. Umbilical artery, C. Popliteal artery, D. Radial artery
D: Radial artery
Answer: D: Radial artery 
Explanation: Allen test can detect the patency of arteries forming the palmar arch . i.e. Radial & Ulnar arteries . In the given options so radial artery is correct .