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: Anatomy
All of the following lie between the 1st rib and the apex of the lung, except 
Select and explain. 
A. Thoracic duct, B. Superior intercostal aery, C. First posterior intercostal vein, D. Sympathetic trunk
A: Thoracic duct
Answer: A: Thoracic duct 
Explanation: Thoracic duct is in the posterior mediastinum . <img src=" /> Ref - BDC 6th editon vol 1 Pg275