This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
Principles of Health education include all Except 
Select and explain. 
A. Credibility, B. Interest, C. Motivation, D. Unknown to known
D: Unknown to known
Answer: D: Unknown to known 
Explanation: Principles of Health education include: Credibility, Interest, Paicipation, Motivation, Comprehension, Reinforcement, Learning by doing, Known to unknown, Setting an example, Good human relations, Feedback, leadersPark 23e Pg: 862