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': 'Test to diagnose thiamine deficiency ? \nSelect and explain. \nA. RBC transketolase, B. FIGLU excretion, C. Methyl-malunic acid in urine, D. Histidine load test', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., RBC transketolase Thiamine diphosphate is also the coenzume for transketolase, in the pentose phosphate pathway.Therefore, thiamine nutritional status is best assessed by erythrocyte (preferred) or whole blood transketolase activity..", 'role': 'assistant'}]