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': 'Fetal abnormality in pregnancy with diabetes : \nSelect and explain. \nA. Sacral agencies, B. Hydrocephalus, C. Respiratory distress syndrome, D. Phocomelia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sacral agencies', 'role': 'assistant'}]