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': 'Alpha fetoprotein levels are increased in all EXCEPT: \nSelect and explain. \nA. Open neural tube defects, B. Twin pregnancy, C. Intrauterine death, D. Down syndrome', 'role': 'user'}, {'content': 'Answer: D \nExplanation: AFP is measured in pregnant women through the analysis of maternal blood or amniotic fluid,\nas a screening test for a subset of developmental abnormalities: it is principally increased in open neural tube defects and omphalocele and is decreased in Down syndrome.', 'role': 'assistant'}]