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
An example for primary prevention of dental diseases is: 
Select and explain. 
A. Scaling & polishing and filling, B. Extractions, RCT and periodontal surgeries, C. Wearing gloves and sterilization of the instruments, D. Replacements of Lost teeth and orthodontic treatments
C: Wearing gloves and sterilization of the instruments
Answer: C: Wearing gloves and sterilization of the instruments 
Explanation: None