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QUESTION
Q363) Pungent odour of faeces is due to ... [MPPMT 1997 ]

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The distinctive odor of feces is due to bacterial action. Gut flora produces compounds such as indole, skatole, and thiols (sulfur-containing compounds), as well as the inorganic gas hydrogen sulfide. These are the same compounds responsible for the odor of flatulence.
Answer : (d)