<prompt> Arsenic inhibits all except :PDHLipoic acida-KG dehydrogenaseEnolase  <response>: D i.e. EnolaseArsenite trivalent form of arsenic forms a stable complex with thiol -SH group of lipoic acid, making it unavailable to serve as a coenzyme. So arsenic poisoning is primarily dt inhibition of enzymes that require lipoic acid lipoate as a coenzyme including E2 of PDH complex, a-Ketoglutarate dehydrogenase and branched chain a-ketoacid dehydrogenaseQ. 