<prompt> Coenzyme in decarboxylation reaction:NiacinBiotinPyridoxineRiboflavin  <response>: Ans. C. PyridoxineCoenzyme for carboxylation reaction--BiotinCoenzyme for decarboxylation--PyridoxineCoenzyme for decarboxylation reactions of Alpha Ketoglutate dehydrogenase and Branched chain Ketoacid dehydrogenase-- Thiamine. 