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: Pediatrics
[{'content': 'First trimester USG finding in Down syndrome? \nSelect and explain. \nA. Nuchal thickening, B. Nuchal translucency, C. Cardiac anomalies, D. GI anomalies', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Nuchal translucency", 'role': 'assistant'}]