This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
[{'content': 'Pyridoxine is involved in \nSelect and explain. \nA. Carboxylation, B. Trans-sulfuration, C. Oxidation-reduction, D. Transketolation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pyridoxine is involved in trans-sulfuration.Sulfur-Containing Amino Acids PLP plays an impoant role in methionine and cysteine metabolism. a.Homocysteine + Serine - Cystathionine. (Enzyme Cystathionine synthase) b.Cystathionine - Homoserine + Cysteine (Enzyme Cystathionase) Both these reactions require PLP. Here transfer of sulphur group occurs.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 396', 'role': 'assistant'}]