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
[{'content': 'Conversion of a complete hydatidiform mole into invasive mole is indicated by all of the following except: \nSelect and explain. \nA. Plateau HCG, B. Enlarged Uterine size, C. Persistence of Theca-lutein cysts, D. Suburethral nodule', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]