42. The reaction of the citric acid cycle that is most similar to the pyruvate dehydrogenase
complex-catalyzed conversion of pyruvate to acetyl-CoA is the conversion of.
(A) citrate to isocitrate.
(B) fumarate to malate.
(C) malate to oxaloacetate.
(D) succinyi-CoA to succinate.
(E) a-ketogiutarate to succinyl-CoA.