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': 'UDP-Glucose is converted to UDP galactose by \nSelect and explain. \nA. lactose synthetase, B. Epimerase, C. Pyruvate kinase, D. all of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]