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
True about H. mole:a) Complete mole seen in human onlyb) Trophoblastic proliferationc) Hydropic degenerationd) Villus pattern absent 
Select and explain. 
A. a, B. bc, C. ac, D. ad
B: bc
Answer: B: bc 
Explanation: H mole:
Microscopically: It is characterised by :

Marked proliferation of the syncytial and cytotrophoblastic epithelium.
Thinning of the stromal tissue due to hydropic degeneration (edema of villous stroma).
Avascular villi.
Maintenance of villus pattern.

Absence of villus pattern is characteristic of choriocarcinoma and not H mole: