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
[{'content': 'Which of the following is a nonmolar trophoblastic neoplasm? \nSelect and explain. \nA. Complete hydatidiform mole, B. Paial hydatidiform mole, C. Invasive mole, D. Choriocarcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: GTD histologically is divided into hydatidiform moles, which are characterized by the presence of villi, and nonmolar trophoblastic neoplasms, which lack villi.Nonmolar trophoblastic neoplasms include choriocarcinoma, placental site trophoblastic tumor,and epithelioid trophoblastic tumor.Reference: William&;s Obstetrics; 25th edition; Chapter 20; Gestational trophoblastic diseases', 'role': 'assistant'}]