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
In amyloidosis Beta pleated sheet will be seen in ? 
Select and explain. 
A. X-ray crystallography, B. Electron microscope, C. Spiral electron microscope, D. Congo red stain
A: X-ray crystallography
Answer: A: X-ray crystallography 
Explanation: Ans. is 'a' i.e. X-ray crystallography