<prompt> Most common cause of gas gangrene ?Cl welchiiCl septicumCl novyiCl histolyticum  <response>: Ans. is a i.e., CI welchii Most common cause of gas gangrene is Cl perfringens Cl welchii causing 80 of cases of gas gangrene. Other causes are Cl septicum, Cl novyi and Cl histolyticum. 