This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Arch of aoa is derived from all except 
Select and explain. 
A. Left horn of aoic sac, B. Left 2nd arch aery, C. Left 4tharch aery, D. Left dorsal aoa
B: Left 2nd arch aery
Answer: B: Left 2nd arch aery 
Explanation: Arch of aoa develops from aoic sac, left horn of aoic sac and left 4th arch aery. Ref: Gray's 39e/p-210-220