This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Twin Pregnancy, Molar Pregnancy, Gestational Trophoblastic disease and contraception in special situations (Sour Grapes!), Subject name: Gynaecology & Obstetrics
Hydatidiform mole in USG appear as:- 
Select and explain. 
A. Snowstorm pattern, B. Snow driven pattern, C. Cotton wool, D. Polka Dot sign
A: Snowstorm pattern
Answer: A: Snowstorm pattern 
Explanation: USG showing snowstorm appearance of Hydatidiform mole Polka dot sign - Thickened trabeculae in a veebral body hemangioma, as seen on axial computed tomographic (CT) The cotton wool appearance - plain film sign of Paget's disease of bone Snow driven appearance - the calcifying epithelial odontogenic tumor (CEOT), also known as a Pindborg tumor