The first compound of the TCA cycle is

Oxalo-succinic acid.

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Oxaloacetic acid.

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Citric acid.

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Cis-aconitic acid.

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Solution

The correct option is C Citric acid.
TCA cycle is also known as Krebs cycle. TCA cycle stands for tricarboxylic acid cycle, which signifies that the first stable product is having three carboxylic groups. The first stable product is citric acid, which is a tricarboxylic acid. It is produced by the condensation of one molecule of acetyl CoA and one molecule of oxaloacetic acid.

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