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: Pathology
[{'content': 'Yellowish discoloration of teeth is seen in children fed\non: \nSelect and explain. \nA. High-protein diet, B. Tetracyclines, C. Penicillins, D. Erythromycin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]