This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious Disease, Subject name: Pathology
[{'content': 'A child of 7-8yrs of ages; c/o scalp swelling, alopecia: \nSelect and explain. \nA. Gram staining, B. KOH staining of the scrapings, C. PAS staining, D. Blood culture', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' KOH staining of scrappingThe child is suffering from tinea capitis.It is a fungal infection which requires KOH scrapping for diagnosis.", 'role': 'assistant'}]