This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and Health, Subject name: Social & Preventive Medicine
[{'content': 'Biological value of a protein is related to \nSelect and explain. \nA. Nitrogen content, B. amino acid content, C. Sulphur content, D. Energy content', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans) a (Nitrogen content) Ref paik 20th ed p 549Biological value of a protein is Retained N2 / Absorbed N2 x 100Protein efficiency ratio = Wt gain in gms / Gram of protein consumedNet protein utilization =Digestibility Coefficent x Biological value100 Aminoacid score =No of mg of one AA/gm of proteinNo of mg of same AA/gm of egg proteinx 100Quality of protein is assessed by comparison to the reference protein which is usually egg protein.', 'role': 'assistant'}]