This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
The best approach to prevent congenital anomalies in infants of diabetic mothers is to? 
Select and explain. 
A. Discontinue insulin and begin glyburide, B. Switch from an oral hypoglycemic agent to insulin until 36-week of gestation, C. Provide continuous insulin infusion during labor and delivery, D. Maintain periconceptional tight control of maternal blood glucose levels
D: Maintain periconceptional tight control of maternal blood glucose levels
Answer: D: Maintain periconceptional tight control of maternal blood glucose levels 
Explanation: .