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: Pathology
Organism involved in smooth surface caries is
1. Streptococcus mutans 2. Actinomyces viscosus
3. Lactobacillus	4. Campylobacter 
Select and explain. 
A. only 1, B. only 2, C. 1 and 3, D. All of the above
A: only 1
Answer: A: only 1 
Explanation: None