This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Doppler ultrasound, all are true except? 
Select and explain. 
A. Monophasic tracing measure normal flow, B. Provide information about blood velocity, C. Direction of blood flow,, D. Degree of stenosis
A: Monophasic tracing measure normal flow
Answer: A: Monophasic tracing measure normal flow 
Explanation: None