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
Regarding S3 heart sound all are true except 
Select and explain. 
A. May be physiological, B. Due to early diastolic filling of ventricles, C. S3 is heard in acute MR, D. Seen in Conditions associated with increased  preload
C: S3 is heard in acute MR
Answer: C: S3 is heard in acute MR 
Explanation: S3 is heard in chronic MR (not in acute MR)