The vitamins produced by activity of microbes are

Options :
  1. B2
  2. B12
  3. both 1 and 2
  4. B2, B12 and C

Answer and Explanation :-

Answer: Option 4


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And therein lies the whole of man's plight. Human time does not turn in a circle it runs ahead in a straight line. That is why man cannot be happy: happiness is the longing for repetition.
-Milan Kundera The Unbearable Lightness of Being