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: Radiology
[{'content': 'Anencephaly can be diagnosed by USG at \nSelect and explain. \nA. 10-12 weeks of gestation, B. 14-18 weeks of gestation, C. 20-24 weeks of gestation, D. 24-28 weeks of gestation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 10-12 weeks of gestation Earliest detectable congenital anomaly on USG is Anencephaly.Q Anencephaly can be diagnosed - Earliest at 10 weeksQ Best at 12 weeksQ (100% accuracy)', 'role': 'assistant'}]