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': 'Congo-red with amyloid produces- \nSelect and explain. \nA. Blue colour, B. Dark brown colour, C. Brilliant pink colour, D. Khaki colour', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The histologic diagnosis of amyloid is based almost entirely on its staining characteristics. The most commonly used staining technique uses the dye Congo red, which under ordinary light impas a pink or red color to amyloid deposits. Under polarized light the Congo red-stained amyloid shows so- called apple-green birefringence Robbins 9 th edition page no. 156', 'role': 'assistant'}]