Arch of aoa is derived from all except: (A) Left horn of aoic sac, (B) Left 2nd arch aery, (C) Left 4tharch aery, (D) Left dorsal aoa
Answer is B. Arch of aoa develops from aoic sac, left horn of aoic sac and left 4th arch aery. Ref: Gray's 39e/p-210-220