This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal Assessment, Subject name: Gynaecology & Obstetrics
Which does not indicate fetal lung maturity' - 
Select and explain. 
A. Reactive NST, B. Gestation 37 weeks, C. Presence of phosphatidyl choline, D. L/S ratio
A: Reactive NST
Answer: A: Reactive NST 
Explanation: Ans. is 'a' i.e., Reactive NST