<prompt> Which among the following controls is an allosteric inhibitor of TCA cyclea Pyruvate dehydrogenaseb Ketoglutarate dehydrogenasec Isocitrate dehydrogenased Malate dehydrogenaseabbcdabc  <response>: Pyruvate dehydrogenase; h i.e., Ketoglutarate dehydrogenase c i.e., Isocitrate dehydrogenase Allosteric modulation in TCA cycle :- Citrate synthase, a-ketoglutarate dehydrogenase, Isocitrate dehydrogenase.Both allosteric and covalent modulation:- PDH complex.Citrate synthase, isocitrate dehydrogenase and a-ketoglutarate dehydrogenase are allosteric enzymes which regulate TCA cycle. 