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
Head of each enamel rod is formed by 
Select and explain. 
A. 1 ameloblast, B. 2 ameloblast, C. 3 ameloblast, D. 4 ameloblast
A: 1 ameloblast
Answer: A: 1 ameloblast 
Explanation: The bulk of the “head” of each rod is formed by one ameloblast, whereas three others contribute components to the “tail” of each rod. According to this interpretation, each rod is formed by four ameloblasts, and each ameloblast contributes to four different rods.