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: Microbiology
[{'content': 'Actinomycosis is caused by: \nSelect and explain. \nA. Fungus, B. Acid fast, non-motile bacillus, C. Anaerobic, gram positive, non-acid fast bacteria, D. Retrovirus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]