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
All of the following are contents of middle mediastinum except 
Select and explain. 
A. Phrenic nerve, B. Ascending aoa, C. Arch of aoa, D. Pulmonary aery
C: Arch of aoa
Answer: C: Arch of aoa 
Explanation: Arch of aoa occupies in the superior mediastinum B D CHAURASIA&;S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME 1 SIXTH EDITION Page no:246