This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Enzyme Action, Subject name: Biochemistry
Enzyme Transketolase requires - 
Select and explain. 
A. FAD, B. TPP, C. PLP, D. FMN
B: TPP
Answer: B: TPP 
Explanation: Ans. is 'b' i.e., TPPo Transketolase reactions require thiamine pyrophosphate (TPP).VitaminActive form (coenzymes)Reaction typeB1 (Thiamin)Thiamine pyrophosphate (TPP)Oxidative decarboxylation, TransketolationB2 (Riboflavin)FMN, FADOxidation / Reduction (Redox reaction)B3 (Niacin)NAD+, NADP+Oxidation / Reduction (Redox reaction)B6 (Pyridoxin)Pyridoxal phosphate (PLP)Transamination, deamination, decarboxylation, condensation, trans-sulfurationB12 (cobolamin)Methylcobalamin. deoxyadenosy Icoba lam inIsomerization of meihylmelonyl-CoA to succinyl-CoA, synthesis of methionine from homocysteineFolic acidTetrahydrofolate (THF)One carbon group transferBiotinBiocytinCarboxylationPantothenic acidPentothenate in Co A and ACPAcyl group transferVitamin KVitamin KCarboxylation of glutamic acid residue