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
In Dean's fluorosis index (WHO Assessment Form), code 2 indicates 
Select and explain. 
A. Very mild fluorosis, B. Mild fluorosis, C. Moderate fluorosis, D. Severe fluorosis
A: Very mild fluorosis
Answer: A: Very mild fluorosis 
Explanation: None