This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
For a woman with history of prior two molar pregnancies, the risk of having a third molar pregnancy is 
Select and explain. 
A. 1%, B. 5%, C. 10%, D. 20%
D: 20%
Answer: D: 20% 
Explanation: For those with a prior complete mole, the risk of another mole is 0.9 percent. With a previous paial mole, the rate is 0.3 percentAfter two prior molar pregnancies, approximately 20 percent of women had a third moleReference: William's Obstetrics; 25th edition, chapter 20; Gestational trophoblastic diseases