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
[{'content': 'Not found commonly in a periapical lesion \nSelect and explain. \nA. Pseudomonas, B. Streptococcus, C. porphyromonas, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The microbiota in periapical region is dominated by anaerobes. Streptococcous are thus not common in periradicular lesions\ncohen 10th\xa0ed pg 575. 576.\nStreptococci are predominant in intraradicular lesions.', 'role': 'assistant'}]