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: Pharmacology
[{'content': 'Griseofulvin is not useful in one of the following : \nSelect and explain. \nA. Tinea capitis, B. Tinea cruris, C. Tinea versicolor, D. Tinea pedis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]