<prompt> Bacteria most commonly involved in bowel decomposition after death is-Streptococcus pyogensClostridium welchiiPseudomonas aerogenosaNone  <response>: Putrefaction is mainly caused by the action of enzyme LECITHINASE produced by clostridium welchi from bowels, Lecithinase caused marked hemolysis, liquefaction in blood vessels tissue spaces. Clostirudium welchi is termed as the chief destructive agent in decomposition 