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
PMA index is used to record the status of: 
Select and explain. 
A. Gingival disease, B. Carious teeth, C. Root caries, D. Periodontal disease
A: Gingival disease
Answer: A: Gingival disease 
Explanation: None