The correct option is A dehydrogenase
Pyruvate is produced by the process of glycolysis in the cytoplasm of a cell. From cytoplasm, it enters the mitochondrial matrix, where pyruvate dehydrogenase catalyses a set of reactions, in the presence of coenzymes, to covert pyruvate into acetyl coA. Acetyl coA then enters the Kreb's cycle or the Tricarboxylic acid (TCA) cycle.