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
Alarm system (a reminder technique for digit sucking in mature children) was developed by: 
Select and explain. 
A. Massler, B. Norton and Gellin, C. Benjamin, D. Pinkham
B: Norton and Gellin
Answer: B: Norton and Gellin 
Explanation: Norton and Gellin developed 3 alarm system.