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': 'In Egg, Egg white contributes \nSelect and explain. \nA. 58%, B. 50%, C. 30%, D. 70%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]