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
The best laboratory test to use in the diagnosis of Lupus vulgaris in the oral cavity is: 
Select and explain. 
A. Bacterial smear, B. Blood studies, C. Biopsy, D. Blood chemistry
C: Biopsy
Answer: C: Biopsy 
Explanation: None