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: None', 'role': 'assistant'}]