This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
Site of biopsy in amyloidosis 
Select and explain. 
A. Kidney, B. Abdominal fat, C. Lip, D. Rectum
D: Rectum
Answer: D: Rectum 
Explanation: Ans. (d) Rectum(Ref': Robbins 9th/pg 257-260)Sites of biopsy for diagnosis of Amyloidosis:Rectal biopsy-Most specific and best siteAbdominal fat aspirateGingival biopsyOrgan specific biopsy for localized amyloidosis