Why citric acid cycle is called TCA cycle?

Please refer the link below:
https://www.meritnation.com/ask-answer/question/what-is-the-kreb-cycle-it-comes-in-the-production-of-enrgy/science/5275207

It is called tricarboxylic acid cycle because the first stable product formed is citric acid, which contains three carboxyl groups.

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It is called so because TCA - tricarboxylicacid. Citric acid contains three carboxylic acid atoms -COOH.
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