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: Social & Preventive Medicine
[{'content': 'Biological value is used for assessment of – \nSelect and explain. \nA. Fat quality, B. Protein quality, C. Carbohydrate quality, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Biological value (BV) \n\nIt is the percentage of absorbed nitrogen retained by the organism.\n\nBV = Retained nitrogen / Absorbed nitrogen x 100', 'role': 'assistant'}]