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': 'The deficiency of thiamine can be identified by measuring the red cell: \nSelect and explain. \nA. Transketolase, B. Transaldolase, C. Alpha ketoglutarate dehydrogenase, D. Pyruvate dehydrogenase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]