In which of the following steps of the Krebs cycle is $CO_2$ released?

  • A
    Isocitric acid $\rightarrow$ Oxalosuccinic acid
  • B
    Oxalosuccinic acid $\rightarrow$ $\alpha$-Ketoglutaric acid
  • C
    Succinic acid $\rightarrow$ Fumaric acid
  • D
    Malic acid $\rightarrow$ Oxaloacetic acid

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