<prompt> Gravis, Intermedius and Mitis are biotypes of:Clostridium perfringensCorynebacterium diphtheriaCapnocytophagaKlebsiella  <response>: Ans. B. Corynebacterium diphtheriaGravis, Intermedius, Mitis and Belfanti are biotypes of Corynebacterium diphtheria. Gravis causes most severe disease. 