সঠিক উত্তর হচ্ছে: চার ধরনের
ব্যাখ্যা: হার্ট সাউন্ড চার ধরনের ।The main normal heart sounds are the S1 and the S2 heart sound. The S3 can be normal, at times, but may be pathologic. A S4 heart sound is almost always pathologic. Heart sounds can be described by their intensity, pitch, location, quality and timing in the cardiac cycle.