This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Surgery
True about thoracic outlet syndrome are the below EXCEPT 
Select and explain. 
A. Adson's test is used for diagnosis, B. It may be caused by cervical rib, C. Pain, numbness and paranesthesia in the involved extremity occur, D. Upper trunks of the brachial plexus are commonly affected
D: Upper trunks of the brachial plexus are commonly affected
Answer: D: Upper trunks of the brachial plexus are commonly affected 
Explanation: Ans. (d) Upper trunk of brachial plexus are commonly affectedRef: Short Cases in Surgery by RRM* In Thoracic outlet syndrome - Lower trunk (C8, T1) Ulnar nerve is compressed* Subclavian artery is compressed - detected by Adson's test