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
In diabetic pregnancy least common is: 
Select and explain. 
A. Caudal regression syndrome, B. Anencephaly`, C. VSD, D. Spina bifida
A: Caudal regression syndrome
Answer: A: Caudal regression syndrome 
Explanation: Caudal regression syndrome