This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Murmurs, Subject name: Medicine
Severity of mitral stenosis is determined by : 
Select and explain. 
A. Intensity of S1 hea sound, B. Diastolic murmur duration, C. Opening snap, D. Intensity of diastolic murmur
B: Diastolic murmur duration
Answer: B: Diastolic murmur duration 
Explanation: Since there is mitral stenosis, more time for blood to enter LV. Therefore, increased transient time, so increase duration of murmur of S1 sound can be loud or soft. If sound is soft it tells us about calcified mitral valves but not of severity