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': 'AFP is increased in maternal serum in all except: \nSelect and explain. \nA. Open neural tube defects, B. Meningomyelocole, C. Spinabifida, D. Trisomy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Trisomy', 'role': 'assistant'}]