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': 'Which of the following protein is biologically complete? \nSelect and explain. \nA. Egg, B. Milk, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A protein is said to be biologically complete if it contains all essential amino acids in amount corresponding to human needs. Examples are milk and egg. Ref: Park 22nd edition, page 564.', 'role': 'assistant'}]