This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrical Ultrasonography in the Second Trimester, Subject name: Radiology
[{'content': 'Snowstorm appearance in Ultrasound is seen in: \nSelect and explain. \nA. Hydatiform mole, B. Twins, C. Hydronephrosis, D. Downs syndrome in fetus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Explanation:On ultrasound, the Hydatiform mole resembles a bunch of grapes (\'cluster of grapes" or \'\'honeycombed uterus" or "snow-storm appearance) (See table below) Partial and Complete Hydatiform Mole PARTIAL MOLECOMPLETE MOLEFetus, Fetal vessels, PlacentaPresentAbsentKaryotype69 XXY (triploid)46 XXHydropic changesFocalMarkedMalignant potentialRare1 5-20%Ultrasound featuresFocal cystic spaces in placentaFetus and placenta are seenTransverse diameter of uterus increasesSnowstorm appearance', 'role': 'assistant'}]