This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
Adson test used for determining vascular insuffciency. 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: Adson's Test (Scalene Test) Instruction Patient is instructed to take a deep breath and hold it Extend the neck fully Turn face towards the side Inference Maneuver tightens the anterior & middle Scalene muscles thus decreasing the interscalene space & magnifying any pre existing compression Obliteration or diminution of radial pulse suggests the diagnosis Ref: Sabiston 20th edition Pgno :1603