Simplify the expression. 
Definitions:
Pulmonary Trunk
A major artery that conducts blood from the right ventricle of the heart to the lungs for oxygenation.
Aorta
The largest artery in the body, originating from the left ventricle of the heart, and supplying oxygenated blood to the circulatory system.
External Iliac Artery
An artery that supplies blood to the lower limbs, originating from the common iliac artery.
Femoral Artery
A major artery in the thigh that provides oxygenated blood to the lower part of the body.
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