Blood leaving the aorta enters which of the following vessels leading to the left forearm?

A) Left subclavian artery
B) Descending aorta
C) Left common carotid artery
D) Right subclavian artery

Left Subclavian Artery

Specifically the subclavian artery that supplies blood to the left arm and side of the brain and thorax, originating from the aortic arch.

Left Forearm

The lower part of the left arm extending from the elbow to the wrist.