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
Caries in a 4 year old child is best assessed by: 
Select and explain. 
A. Previous caries experience, B. Maternal caries, C. School fluoridation, D. Daily fluoride mouthwash
A: Previous caries experience
Answer: A: Previous caries experience 
Explanation: None