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': 'Best indicator of protein quality is: \nSelect and explain. \nA. Net protein utilization, B. Digestibility coefficient, C. Biological value, D. Amino acid score', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The net protein utilization, or NPU, is the ratio of amino acid conveed to proteins to the ratio of amino acids supplied. It may be affected by the salvage of essential amino acids within the body, but is profoundly affected by the level of limiting amino acids within a foodstuff.This value can be determined by determining dietary protein intake and then measuring nitrogen excretion. One formula for NPU is:NPU = ((0.16 x (24 hour protein intake in grams)) - ((24 hour urinary urea nitrogen) + 2) - (0.1 x (ideal body weight in kilograms))) / (0.16 x (24 hour protein intake in grams))As a value, NPU can range from 1 to 0, with a value of 1 indicating 100% utilization of dietary nitrogen as protein and a value of 0 an indication that none of the nitrogen supplied was conveed to protein.', 'role': 'assistant'}]