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
The social engineering phase in public health is between the years: 
Select and explain. 
A. 1880-1920, B. 1920-1960, C. 1960-1980, D. 1981-2000
C: 1960-1980
Answer: C: 1960-1980 
Explanation: None