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
Biological value of proteins refers to the 
Select and explain. 
A. Proteins efficiency ratio, B. Proteins biologic value, C. Protein energy ratio, D. Calorific value
A: Proteins efficiency ratio
Answer: A: Proteins efficiency ratio 
Explanation: None