This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Confirmatory test for the diagnosis of Amyloidosis- \nSelect and explain. \nA. Diagnostic peritoneal lavage, B. Tongue biopsy, C. Rectal biopsy, D. Whole body CT scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Biopsy and subsequent Congo red staining is the most impoant tool in the diagnosis of amyloidosis. In general, biopsy is taken from the organ suspected to be involved. For example, renal biopsy is useful in the presence of urinary abnormalities. Rectal and gingival biopsy specimens contain amyloid in as many as 75% of cases with generalized amyloidosis Robbins page no. 172', 'role': 'assistant'}]