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
Rate of subsequent GTN in complete molar pregnancy? 
Select and explain. 
A. < 1 %, B. 1-5 %, C. 5-10 %, D. 15-20 %
D: 15-20 %
Answer: D: 15-20 % 
Explanation: Complete moles have a 15 to 20 percent incidence of malignant sequelae, compared with 1 to 5 percent following paial moles.Reference: William's Obstetrics; 25th edition, chapter 20; Gestational trophoblastic diseases