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: Unknown
[{'content': 'which ultrasound finding has highest association with aneuploidy \nSelect and explain. \nA. Choroid plexus cyst, B. Nuchal translucency, C. Cystic hygroma, D. Single umbilical artery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All the above mentioned are ultrasound findings associated with increased risk of aneuploidy although the highest association is seen with cystic hygroma\nNuchal translucency and cystic hygroma are both measured in first trimester\nTrisomy 21 is the most common aneuploidy associated with increased NT and cystic hygroma While monosomy X presents as second trimester hygroma.', 'role': 'assistant'}]