This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycobacterial Infections, Subject name: Dental
[{'content': 'The given technique is useful in diagnosis of: \nSelect and explain. \nA. Unreadable image, B. Lichen planus, C. Basal cell carcinoma, D. Leprosy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The clip shows slit skin smear taken from pinna. It is used for diagnosis of leprosy.', 'role': 'assistant'}]