Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

1. A. (1) Malic acid → Oxaloacetic acid
2. B. (2) Succinic acid → Malic acid
3. C. (3) Succinyl-CoA → Succinic acid
4. D. (4) Isocitrate → -ketoglutaric acid

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