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
[{'content': 'Anencephaly can be diagnosed by ultrasound at: \nSelect and explain. \nA. 14-18 week of gestation, B. 20-24 week of gestation, C. 24-37 weeks of gestation, D. 10-12 week of gestation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 10-12 week of gestation', 'role': 'assistant'}]