During the TCA cycle, at which step does substrate-level phosphorylation take place?

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At the succinate dehydrogenase enzymeDuring the reduction of malonateAt the thiokinase-catalyzed reactionSubstrate-level phosphorylation does not occur in the TCA cycleNone of these

Explanation

Substrate-level phosphorylation in the TCA cycle occurs specifically at the step catalyzed by thiokinase (also known as succinyl-CoA synthetase), where GTP (or ATP) is generated directly from the conversion of succinyl-CoA to succinate.