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
The structure found in a cross-section of the thorax at T4 veebra is : 
Select and explain. 
A. Azygos vein, B. Brachiocephalic aery, C. Arch of the aoa, D. Left Subclan aery
C: Arch of the aoa
Answer: C: Arch of the aoa 
Explanation: C i.e. Arch of aoa