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
A 4-year-old presents with Labia lingual caries affecting only maxillary incisors and involving molars
The number of Streptococcus mutans Colony forming
units (CFU) per unit of saliva will be 
Select and explain. 
A. Negligible, B. <100000, C. 10000-10,00,000, D. >10,00,000
D: >10,00,000
Answer: D: >10,00,000 
Explanation: None