This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Carboxylation is governed by - \nSelect and explain. \nA. Biotin, B. Niacin, C. Thiamine, D. Pyridoxine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Biotin VitaminActive form (coenzvmes)Reaction typeB1 (Thiamin)Thiamine pyrophosphate (TPP)Oxidative decarboxylation, TransketolationB2 (Riboflavin)FMNt FADOxidation / Reduction (Redox reaction)B3 (Niacin)NAD\\ NADP"Oxidation / Reduction (Redox reaction)B6 (Pyridoxin)Pyridoxal phosphate (PLP)Transamination, deamination, decarboxylation, condensation, trans-sulfurationBp (cobolamin)Methylcobalamin, deoxyadenosylcobalaminIsomerization of methylmelonyl-CoA to succinvl-CoA, synthesis of methionine from homocysteineFolic acidTetrahydrofolate (THF)One carbon group transferBiotinBiocytinCarboxylationPantothenic acidPentothenate in CoA and ACPAcyl group transferVitamin KVitamin KCarboxylation of glutamic acid residue', 'role': 'assistant'}]