This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Arch of aorta develops from: 
Select and explain. 
A. Right 4th aortic arch, B. Left 4th aortic arch, C. Right 6th aortic arch, D. Left 6th aortic arch
B: Left 4th aortic arch
Answer: B: Left 4th aortic arch 
Explanation: Ans. B. Left 4th aortic archThe aortic arch is the connection between the ascending and descending aorta, and its central part is formed by the left 4th aortic arch during early development