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 the structures are seen in transverse section at T4 veebral level except: 
Select and explain. 
A. Arch of aoa, B. Thymus, C. Azygous vein, D. Thoracic duct
C: Azygous vein
Answer: C: Azygous vein 
Explanation: C i.e. Azygous vein