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
Ultrasonography of a pregnant female's uterus shows 'Snow storm appearance', which is indicative of: 
Select and explain. 
A. TB fallopian tube, B. Hydramnios, C. H. mole, D. Adenomyosis
C: H. mole
Answer: C: H. mole 
Explanation: Characteristic echogram of molar pregnancy is 'snow storm' appearance due to multiple small sonolucencies due to the hydropic villi. Fetal tissues and amniotic sac are absent. In contrast, sonographic features of a paial molar pregnancy include a thickened, hydropic placenta with a concomitant fetus. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 37. Gestational Trophoblastic Disease. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.