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': 'Definitive diagnosis of sporotrichosis generally depends on: \nSelect and explain. \nA. Serology, B. Culture, C. Biopsy, D. KOH preparation from the lesion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Culture', 'role': 'assistant'}]