Krebs' cycle begins with the reaction

  • A
    Citric acid + acetyl Co-$A$
  • B
    Oxaloacetic acid + pyruvic acid
  • C
    Oxaloacetic acid + citric acid
  • D
    Oxaloacetic acid + acetyl Co-$A$

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In the $Krebs$ cycle,$FAD$ acts as an electron acceptor during the conversion of which of the following?

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