Final answer:
A partial molar pregnancy has a lower risk of developing GTD (gestational trophoblastic disease).
Step-by-step explanation:
The molar pregnancy that has a lower risk of developing GTD (gestational trophoblastic disease) is a partial molar pregnancy.
In a partial molar pregnancy, there is an abnormal growth of placental tissue. The fertilized egg usually has two sets of chromosomes from the father and one set from the mother, resulting in an excess of paternal genetic material.
This abnormal genetic makeup reduces the risk of developing GTD compared to a complete molar pregnancy, where there is no fetal tissue and only paternal genetic material is present.