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: Dental
[{'content': 'Dose of tetracycline which coloration as well as hypoplasia of enamel: \nSelect and explain. \nA. 5 mg/kg body weight, B. 15 mg/kg body weight, C. 20 mg/kg body weight, D. 50 mg/kg body weight', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Many clinical studies revealed that average dose consumption of 20-35 mg/kg body weight / day during tooth formation results in -discoloration. Doses > 35 mg/kg/ day results in both discoloration and hypoplasia of enamel.', 'role': 'assistant'}]