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 left subclan aery is a branch of : 
Select and explain. 
A. Bracheocephalic trunk, B. Ascending aoa, C. Arch of aoa, D. Left common carotid
C: Arch of aoa
Answer: C: Arch of aoa 
Explanation: C i.e. Arch of aoa