Methanogens are found in
$I.$ organic acid
$II.$ rumen of cattle
$III.$ butanal
$IV.$ anaerobic sludge
Choose the correct option

  • A
    $I$ and $II$
  • B
    $II$ and $III$
  • C
    $II$ and $IV$
  • D
    $III$ and $IV$

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