This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital CNS malformations, Subject name: Pediatrics
[{'content': 'Most specific congenital abnormality in a baby born to a diabetic woman is? \nSelect and explain. \nA. Ventricular Septal defect, B. Sacral agenesis, C. Meningomyelocele, D. Transposition of great aeries', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -Sacral agenesis or Caudal regression syndrome is the most specific congenital abnormality in a baby born to a diabetic woman.', 'role': 'assistant'}]