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: Pathology
[{'content': 'The best laboratory test to use in the diagnosis of Lupus vulgaris in the oral cavity is: \nSelect and explain. \nA. Bacterial smear, B. Blood studies, C. Biopsy, D. Blood chemistry', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]