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': 'A 10-yr-old boy presented with painful boggy swelling of scalp, multiple sinuses with purulent discharge, easily pluckable hair, and lymph nodes enlarged in occipital region. Which one of the following would be most help ful for diagnostic evaluation? \nSelect and explain. \nA. Biopsy and Giemsa staining, B. Bacterial culture, C. KOH mount, D. Patch test, Gram staining Tzank smear', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. KOH mount', 'role': 'assistant'}]