<prompt> Soft S1 is seen in all except:First degree hea blockARCalcified valveMild MS  <response>: MS: Trans-valvular gradient, faster opening and faster elastic recoil - lt loud S1 Option A- Causes bradycardia lt soft S1 Option B- Blood comes black in LV, so increased volume in L.V during diastole dt defective aoic valve closure blood comes back into the ventricle.The gradient stas reducing so lt soft S1 sound. Option C -S1 become Soft once valve get calcified. 