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': 'Egg yields about -------K cal of energy – \nSelect and explain. \nA. 50, B. 60, C. 70, D. 80', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]