This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
All of the following are true about the root of right lung except? 
Select and explain. 
A. Azygous vein crosses anteriorly and superiorly, B. Vagus crosses it anteriorly, C. Phrenic nerve crosses it anteriorly, D. SVC is present anteriorly
B: Vagus crosses it anteriorly
Answer: B: Vagus crosses it anteriorly 
Explanation: Ans 'b'i.e., Vagus crosses it anteriorly(Ref: Snell's 7th/e p. 94; BDC 4'h/e Vol.l p. 224)Vagus nerve crosses both hila posteriorly.Azygous vein arches the hilum of right lung (azygous vein is superior to hilum)Phrenic nerve (on both sides) and SVC (on right side) are anterior.