<prompt> Which one of the following regarding antenatal assessment of umbilical aeries by Color Doppler studyis TRUE?There is decreased SD ratio in smoker and nicotine abusing pregnant femalesThe reduced diastolic flow at term indicates good prognosisThe flow velocities and the SD ratio are useful to evaluate high risk pregnanciesIn otherwise normal pregnancies the increased SD ratio is normal in smoking females  <response>: C i.e. The flow velocities SD ratio are useful to evaluate high risk pregnancies Colour doppler analysis of umbilical aeries play an impoant role in assessment of high risk fetus pregnancyQ. 