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
[{'content': 'Caries, all are true except: \nSelect and explain. \nA. Lactobacillus is main causative organism in plaque, B. bsmooth surface caries occur due to streptococcus mutans, C. Pit and Fissure caries can be prevented by using pit and tissue sealants, D. Fluorides help in reducing caries incidence', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]