This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Conversion of a complete hydatidiform mole into invasive mole is indicated by all of the following except: 
Select and explain. 
A. Plateau HCG, B. Enlarged Uterine size, C. Persistence of Theca-lutein cysts, D. Suburethral nodule
D: Suburethral nodule
Answer: D: Suburethral nodule 
Explanation: An invasive mole rarely develops metastasis and hence presence of suburethral nodule should not be regarded as an indicator of conversion of hydatiform mole into an invasive mole. Ref: Donald School Textbook of Ultrasound in Obstetrics and Gynecology By Kurjak, 2nd Edition, Page 251, 252; Essentials of Human Disease By Leonard Crowley, 2011, Page 313.