This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
Which one of the following medical disorders leads to delayed foetal lung maturity 
Select and explain. 
A. Hea disease, B. Diabetes, C. Thalassemia minor, D. Epilepsy
B: Diabetes
Answer: B: Diabetes 
Explanation: Maternal diabetes mellitus cause delayed fetal lung maturation. Maternal hyperglycemia causes fetal hyperglycemia which in turn causes fetal hyperinsulinemia. Fetal hyperinsulinemia impairs surfactant production in the lung which in turn causes delay in lung maturity and predisposes to respiratory distress syndrome. Reference : 243 Textbook of Obstetrics Sheila Balakrishnan 2nd edition