This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Investigations, Subject name: Forensic Medicine
[{'content': 'Bacteria most commonly involved in bowel decomposition after death is - \nSelect and explain. \nA. Streptococcus pyogens, B. Clostridium welchii, C. Pseudomonas aerogenosa, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Clostridium welchii o Bowel decomposition is brought about by aerobic and anaerobic bacteria present in small intestine (e.g. C. welchii, staphylococcus, E.coli etc.) which release enzymes (especially lipase and lecithinase) which act on body to cause breakdown.", 'role': 'assistant'}]