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
[{'content': 'Adson test used for determining vascular insuffciency. It is useful in \nSelect and explain. \nA. Peripheral vascular disease, B. Varicose veins, C. Cervical rib, D. AV fistula', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]