I want to know the answer to the following question:
Which vitamin are the bacteria present in the gut responsible for producing?
All the background I'm provided with is that "Bacteria in the gut perform many important functions for humans, including breaking down and aiding in the absorption of otherwise indigestible food; stimulating cell growth; repressing the growth of harmful bacteria, training the immune system to respond only to pathogens; producing vitamin B12; and defending against some infectious diseases.". Is that enough to answer the question?