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
The predominant fibre groups affected in the early lesion of gingivitis are: 
Select and explain. 
A. Circular and dentogingival, B. Circular and horizontal, C. Circular and alveolar crest, D. Circular and transseptal
A: Circular and dentogingival
Answer: A: Circular and dentogingival 
Explanation: None