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
Which of the following is an approach in health education: 
Select and explain. 
A. Regulatory approach, B. Service approach, C. Educational approach, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Approaches in Health Education:

Regulatory approach
Service approach
Educational approach
Primary Health Care approach