This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
[{'content': 'a patient presented with swelling in his right foot with multiple discharging sinuses.the leison did not respond to antibiotics the likely etiological agent would be ? \nSelect and explain. \nA. actino madura, B. nocardia, C. SPOROTHRIX, D. madurella mycetomatis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Madurella mycetomatis causes the majority of the cases with the black grains. It is imperfect dematiaceous mold with brown colonies and diffused honey-colord pigment. Causes of mycetoma Eumycetoma : caused by species of fungi as: 1-Madurella mycetomatis 2-Madurella grisea 3-Leptosphaeria senegalensis 4-Pseudallescheria boydii 5-Acremonium (A.faciform, A.kiliense, A.recifei) 6-Aspergillus spp. (A. nidulans A. flavus) ref : thomas habif', 'role': 'assistant'}]