This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gestational Trophoblastic Disease, Subject name: Gynaecology & Obstetrics
[{'content': 'Possible cause of choriocarcinoma after hydatidiform mole is all except: \nSelect and explain. \nA. Rising hCG, B. More Theca lutein cysts, C. Increase uterus size, D. Sub urethral nodule', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b, i.e. More theca lutein cystsSuburethral Nodule indicates metastases choriocarcinoma. All others are very well seen in the conversion of a complete hydatidiform mole into choriocarcinoma except more theca lutein cyst.It is not the number of cyst but size of cyst (>= 6 cms) which indicate neoplastic \\conversion.Suburethral nodule may be a manifestation of vaginal metastasis from choriocarcinoma.Metastatic choriocarcinoma is however seen in only about 4% of patients after evacuation of a complete mole and vaginal metastasis that may present with suburethral nodule occur in only 30% of patients with such metastatic disease. Hence it is an unusual indicator.Raised b-hCG level present in choriocarcinoma.', 'role': 'assistant'}]