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': 'Villous pattern is lost in : \nSelect and explain. \nA. Invasive mole, B. Tubal mole, C. Hydatidiform mole, D. Choriocarcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Choriocarcinoma', 'role': 'assistant'}]