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
[{'content': 'Amyloid is best identified by - \nSelect and explain. \nA. Staining with methyl violet, B. Secondary fluorescence in UV light with riboflavin, C. Congo red, D. Green birefringence of stained amyloid when viewed by polarizing microscope', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Green birefringence of stained amyloid when viewed by polarizing microscope", 'role': 'assistant'}]