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': 'Appropriate material for antenatal diagnosis of I genetic disorders includes all of the following except: \nSelect and explain. \nA. Fetal blood, B. Amniotic fluid, C. Chorionic villi, D. Maternal urine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Maternal urine for prenatal diagnosis--an analysis of cell-free fetal DNA in maternal urine and plasma in the third trimester.', 'role': 'assistant'}]