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': 'Which strain of yeast is found in the root canal: \nSelect and explain. \nA. Candida albicans, B. Cryptococcus, C. Histoplasma, D. Actinomyces', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]