Which of the following vitamins are produced by symbiotic bacteria in humans?

Which of the following vitamins are produced by symbiotic bacteria in humans?

Q. Which of the following vitamins are produced by symbiotic bacteria in humans?

A.            Vitamin-B and K

B.            Vitamin-A and B

C.            Vitarmin-E

D.            Vitamin-D

Answer: Vitamin-B and K

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