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
Amelogenesisimperfecta is due to? 
Select and explain. 
A. ENAM, B. MSX-1, C. DSPP, D. PAX-9
A: ENAM
Answer: A: ENAM 
Explanation: None