This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
[{'content': 'Botryomycosis is caused by: \nSelect and explain. \nA. Bacteria, B. Fungus, C. Virus, D. Protozoa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Botryomycosis - Botryomycosis is caused by Bacteria. S. aureus is the most common pathogen -hence the name " Botryo" = Cluster of grapes ( S. aureus grows in grape- like clusters on culture), "mycosis" = is a misnomer - not a fungal infection Nodular lesion which bursts to create chronic sinuses that discharge sulfur granules resembles mycetoma. Gram-positive organisms, paicularly like S. aureus are usually involved, but Gram-negative organisms like Actinobacillus and Pseudomonas may also be implicated', 'role': 'assistant'}]