Ultrasound of the pregnant women shows normal functioning of the fetal cardiovascular system and ductus arteriosus. What vessels are connected by the ductus arteriosus ?

Answer options

1. Pulmonary trunk and aorta
2. Pulmonary trunk and inferior vena cava
3. Umbilical vein and aorta
4. Pulmonary trunk and superior vena cava
5. Umbilical artery and umbilical vein