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': 'Biological value of proteins refers to the \nSelect and explain. \nA. Proteins efficiency ratio, B. Proteins biologic value, C. Protein energy ratio, D. Calorific value', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]