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
The severity of mitral regurgitation is decided by all of the following clinical findings except 
Select and explain. 
A. Presence of mid- diastolic murmur across mitral valve, B. Wide split second heart sound., C. Presence of left ventricular S3 gallop., D. Intensity of systolic murmur across mitral valve
D: Intensity of systolic murmur across mitral valve
Answer: D: Intensity of systolic murmur across mitral valve 
Explanation: None