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
Plasma cells are mostly seen in one of the stages of gingivitis 
Select and explain. 
A. Initial lesion, B. Early lesion, C. Established lesion, D. Advanced lesion
C: Established lesion
Answer: C: Established lesion 
Explanation: None