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': 'Enzyme activity measured in beri-beri is \nSelect and explain. \nA. Transketolase, B. Transaminase, C. Decarboxylase, D. Deaminases', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The transketolase activity in erythrocytes\xa0 is decreased. MeasuremenL of\xa0 RBC transketolase activity is\xa0 a\xa0 reliable diagnostic test to\xa0 assess thiamine deficiency.\nRef: Satyanarayana, 3rd ed, pg-136', 'role': 'assistant'}]