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
Recommended observation period prior to orthodontic treatment in minor Periodontal injuries: 
Select and explain. 
A. 3 months, B. 6 months, C. 9 months, D. 12 months
A: 3 months
Answer: A: 3 months 
Explanation: Recommended observation periods prior to orthodontic treatment