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
Dose of tetracycline which coloration as well as hypoplasia of enamel: 
Select and explain. 
A. 5 mg/kg body weight, B. 15 mg/kg body weight, C. 20 mg/kg body weight, D. 50 mg/kg body weight
D: 50 mg/kg body weight
Answer: D: 50 mg/kg body weight 
Explanation: 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.