The ductus arteriosus is a small vessel connecting the pulmonary trunk to the aorta in fetal circulation.
What is fetus?
- "An unborn human offspring which is more than eight weeks old after conception."
What is ductus arteriosus?
- "It is a blood vessel that allows blood to go around the baby's lungs before birth."
- It is a fetal artery that connects aorta of fetus and pulmonary artery.
- It is also present after birth but soon disappears as they do not have any further role.
Hence, the correct option is D) ductus arteriosus.
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