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: Skin
[{'content': 'Black dot ring worm is caused by- \nSelect and explain. \nA. Microsporon, B. Trichophyton, C. Epidermophyton, D. Candida', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Trichophyton', 'role': 'assistant'}]