This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
Fetal pulmonary maturity can be evaluated by phospholipid activity in amniotic fluid. In which of the following pregnancies does the fetus have the least chance of developing respiratory distress syndrome (RDS)? 
Select and explain. 
A. Normal pregnancy; amniotic fluid L/S is 1.8:1, phosphatidyl glycerol (PG) is absent, B. Hypeensive pregnancy; amniotic fluid L/S is 1.8:1, PG is absent, C. Hypeensive pregnancy; amniotic fluid L/S is 2:1, PG is absent, D. Diabetic pregnancy; amniotic fluid L/S is 2:1, PG is present
D: Diabetic pregnancy; amniotic fluid L/S is 2:1, PG is present
Answer: D: Diabetic pregnancy; amniotic fluid L/S is 2:1, PG is present 
Explanation: - The presence of phosphatidylglycerol in amniotic fluid reliably indicates lung maturation. This also is the 'Final indicator of pulmonary' maturity. - PG is present only in option 4 thus fetus have the least chance of developing respiratory distress syndrome (RDS) in option 4