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
Periodontal surgery is best performed 
Select and explain. 
A. 4 weeks after completion of the hygienic phase, B. 8 weeks after the completion of the restorative phase, C. 4 weeks before completion of occlusal adjustments, D. Immediately after the completion of the hygienic phase
A: 4 weeks after completion of the hygienic phase
Answer: A: 4 weeks after completion of the hygienic phase 
Explanation: None