This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
Adson&;s test is positive in - 
Select and explain. 
A. Cervical rib, B. Cervical spondylosis, C. Cervical fracture, D. Cervical dislocation
A: Cervical rib
Answer: A: Cervical rib 
Explanation: Adson&;s test is a provocative test for Thoracic Outlet Syndrome accompanied by compression of the Subclan aery by a cervical rib or tightened anterior and middle scalene muscles. Ref : Bailey and love surgery text book 27th Ed.