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: Unknown
Confirmatory test for the diagnosis of Amyloidosis is : 
Select and explain. 
A. Diagnostic peritoneal lavage, B. Tongue biopsy, C. Rectal biopsy, D. Whole body CT scan
C: Rectal biopsy
Answer: C: Rectal biopsy 
Explanation: ANSWER: (C) Rectal biopsyREF: Robbin s pathology 7th edition page 264Diagnosis of Amyloidosis depends on the demonstration of amyloid deposits in tissue. The most common sites biopsied are the kidney, when renal manifestations are present, or rectal or gingival tissue in patients suspected of having systemic amyloidosis.