Fetal pulmonary maturity can be evaluated by phospholipids' activity in amniotic fluid. In which of the following pregnancies does the fetus have the least chance of developing respiratory distress syndrome (RDS)?
Normal pregnancy: amniotic fluid L/S is 1.8:1, phosphatidyl glycerol (PG) is absent Diabetic pregnancy: amniotic fluid L/S is 2:1, PG is absent Diabetic pregnancy: amniotic fluid L/S is 2:1, PG is present. All of the above