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
For periodontal patients, the most frequently recommended tooth brushing technique is: 
Select and explain. 
A. Scrub technique, B. Roll technique, C. Sulcular technique, D. Fones technique
C: Sulcular technique
Answer: C: Sulcular technique 
Explanation: None