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': 'Best method to compare protein quality is:(1994) \nSelect and explain. \nA. Net protein utilization, B. Biological value, C. Specific dynamic action of protein, D. Presence or absence of essential amino acids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: aRef: Park, 17th ed, p. 414 & 18th ed, p. 440', 'role': 'assistant'}]