Which of the following vitamins are produced by symbiotic bacteria in humans?
A
Vitamins B and K
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B
Vitamins A and B
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C
Vitamin E
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D
Vitamin D
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Solution
The correct option is A Vitamins B and K Thiamine, folate, biotin, riboflavin and panthothenic acid are water-soluble vitamins that are plentiful in the diet, but they are also synthesized by gut bacteria. Likewise, it has been estimated that up to half of the daily Vitamin K requirement is provided by the gut bacteria.