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
Gingival biopsy is useful in the diagnosis of - 
Select and explain. 
A. Sarcoidosis, B. Amyloidosis, C. Histoplasmosis, D. Scurvy
B: Amyloidosis
Answer: B: Amyloidosis 
Explanation: Ans. is 'b' i.e., Amyloidosis