Which among the following controls is an allosteric inhibitor of TCA cyclea) Pyruvate dehydrogenaseb) Ketoglutarate dehydrogenasec) Isocitrate dehydrogenased) Malate dehydrogenase

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".