This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gestational Diabetes Mellitus, Subject name: Gynaecology & Obstetrics
[{'content': 'One of the following is the most specific cardiac anomaly of a newborn to a diabetic mother: \nSelect and explain. \nA. VSD, B. Transposition of great vessels, C. PDA, D. Pulmonic stenoisis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Congenital malformation in fetus of a diabetic mother : * M/C system involved in congenital malformation CVS > CNS * Most specific structural anomaly seen - caudal regression syndrome ( sacral agenesis ) * Most specific cardiac anomaly seen in babes of diabetic mother - TGV', 'role': 'assistant'}]