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
Lactic acid is produced in mouth by 
Select and explain. 
A. Saccharolytic bacteria in supragingival region, B. Saccharolytic bacteria in subgingival region, C. Non-saccharolytic bacteria in supragingival region, D. Non-saccharolytic bacteria in subgingival region
A: Saccharolytic bacteria in supragingival region
Answer: A: Saccharolytic bacteria in supragingival region 
Explanation: None