The large arterial trunk that carries blood away from the heart.

• A. Pulmonary artery
• B. Vena cava
• C. Aneurysm
• D. Aorta

Answer: (D)

The main idea is that arteries carry blood away from the heart, and the largest arterial trunk that does so for the entire body is the aorta. It starts at the left ventricle and arches through the chest and abdomen, delivering oxygen-rich blood to systemic tissues via its branches. The pulmonary artery also carries blood away from the heart, but it leads to the lungs rather than distributing to the whole body. The vena cava are veins carrying blood back to the heart, not arteries. An aneurysm is a pathological dilation of a vessel, not a vessel type itself. So the vessel that fits the description is the aorta.