In this Black Dahlia presentation of the rat diaphragm what

In this “Black Dahlia” presentation of the rat diaphragm, what is the structure labelled A?

Which of following is structure A?

aorta

superior vena cava

inferior vena cava

esophagus

Solution

The correct answer is :superior venacava.

Reason:The part labelled is superior vena cava that collects deoxygenated blood to heart.