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': 'In diabetic pregnancy least common is: \nSelect and explain. \nA. Caudal regression syndrome, B. Anencephaly`, C. VSD, D. Spina bifida', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Caudal regression syndrome', 'role': 'assistant'}]