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
Enamel is laid down 
Select and explain. 
A. Mainly by odontoblasts, B. Mainly by ameloblasts, C. Only on odontoblasts, D. Only by ameloblasts
D: Only by ameloblasts
Answer: D: Only by ameloblasts 
Explanation: None