<prompt> Which of the following enzymes require NAD as cofactor?Citrate SynthaseIsocitrate Dehydrogenasea-Ketoglutarate dehydrogenaseSuccinate Thiokinase  <response>: a-Ketoglutarate dehydrogenase REF: Harper 27th ed p. 496 NAD is cofactor in: Lactate dehydrogenase Pyruvate dehydrogenase Alpha ketoglutrate dehydrogenase 