This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': "Adson's test is used for determining vascular insufficiency. 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 is used for determining vascular insufficiency due to Cervical rib.", 'role': 'assistant'}]