This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
True about brachiocephalic vein is all except 
Select and explain. 
A. Formed behind sternoclavicular joint, B. Left vein is longer, C. Right runs veical, D. Right vein unite at 1st costal cailage
D: Right vein unite at 1st costal cailage
Answer: D: Right vein unite at 1st costal cailage 
Explanation: Right brachiocephalic vein joins left brachiocephalic vein at 1st costal cailage to form superior vena cava. this is present in the superior mediastinum Ref: Gray's 38e/p1026