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': 'The organism least likely to be found in normal gingival\ncrevices is \nSelect and explain. \nA. Fusobacterim sp., B. Actionomyces sp., C. Diphtheroids, D. Streptococci sps.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]