From the given below,which one increases vitamin $B_{12}$ in our stomach and also plays a very beneficial role in checking disease-causing microbes?

  • A
    Antibiotic
  • B
    Lactic acid bacteria
  • C
    Saccharomyces cerevisiae
  • D
    Aspergillus niger

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Mushrooms are a rich source of . . . . . . .

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Which was discovered by Alexander Fleming?

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