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
Adson test is used for determining vascular suffiency. It is useful in 
Select and explain. 
A. Peripheral vascular disease, B. Varicose veins, C. Cervical rib, D. AV fistula
C: Cervical rib
Answer: C: Cervical rib 
Explanation: None