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
Hydatidiform -- mole is characterized histologically by : 
Select and explain. 
A. Hyaline membrane degeneration, B. Hydropic degeneration of the villous stroma, C. Non proliferation of cytotrophoblast, D. Non proliferation of syncytiotrophoblast
B: Hydropic degeneration of the villous stroma
Answer: B: Hydropic degeneration of the villous stroma 
Explanation: Hydropic degeneration of the villous stroma