This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
The earliest sign of uteroplacental insufficiency on Doppler is? 
Select and explain. 
A. Diastolic notch, B. Reversal of diastolic flow, C. Blunting of systolic flow, D. Absent mid diastolic flow
A: Diastolic notch
Answer: A: Diastolic notch 
Explanation: Ans AThe signs of uteroplacental insufficiency in increasing order of severity are early/pre diastolic notch, absent diastolic flow and lastly reversal of flow during diastole.