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: Biochemistry
[{'content': 'Thiamine acts as a cofactor in : \nSelect and explain. \nA. Conversion of pyruvate to acetyl-CoA, B. Transa mina tion reactions, C. Oxidation in respiratory chain, D. Conversion of pyridoxal to pyridoxal phosphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Conversion of Pyruvate to acetyl COA', 'role': 'assistant'}]