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': 'Which of these is characteristic of amyloidosis- \nSelect and explain. \nA. Beta pleated, metachromosis, PAS + ve, B. Congophilic, beta pleated, PAS +ve, C. Beta pleated, fibrillary, congophilic, D. Alpha pleated, small fibrils', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Robbins and Cotran pathologic basis of disease South Asia edition. *by electron microscopy all types amyloid consist of continuous non branching fibrills.X Ray crystallography and infrared spectroscopy demonstrate a characteristic cross-beta-pleated shear conformation .this conformation is responsible for distinctive Congo red staining and birefringence of amyloid.', 'role': 'assistant'}]