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
The root of the right lung does not lie behind which one of the following 
Select and explain. 
A. Right atrium, B. Right vagus, C. Superior vena cava, D. Phrenic nerve
B: Right vagus
Answer: B: Right vagus 
Explanation: Right vagus is the posterior relation of the root B D CHAURASIA'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME1 page no-237,238