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
Best test for fetal maturity in a diabetic mother is : 
Select and explain. 
A. L:S ratio, B. Lecithin-cephalin ratio, C. Phosphatidyl choline, D. Phosphatidyl glycerol
D: Phosphatidyl glycerol
Answer: D: Phosphatidyl glycerol 
Explanation: None