A complex enzyme system functional in Krebs cycle is

Citrate synthetase

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Isocitrate dehydrogenase.

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Oxalosuccinate decarboxylase

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α

-ketoglutarate dehydrogenase

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Solution

The correct option is B $α$ -ketoglutarate dehydrogenase
Alpha-ketoglutarate dehydrogenase is a complex enzyme system functional in Krebs cycle and catalyzes the 5th step of Krebs cycle. In this coenzyme A reacts with α- ketoglutarate forming 4-carbon succinyl coenzyme A and releasing carbon dioxide and a pair of hydrogen atoms. The pair of hydrogen atoms pairs two electrons and one proton to NAD +, forming NADH and H+.
Thus, the correct answer is option D.

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