Answer
On the left side this is the left common carotid
Note regarding 11:1
There are three answers namely, the celiac trunk, the superior mesenteric artery and the inferior mesenteric artery.
Work Step by Step
The situation is different on the right side because both the left common carotid and the left sub-clavian branch off from the brachiocephalic trunk which is the first branch off the aortic arch on the right.