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: Dental
[{'content': "Best diagnostic test for fungal skin infection – \nSelect and explain. \nA. KOH test, B. Diascopy, C. Wood's lamp, D. Patch test", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]