This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histo Pathology, Subject name: Pathology
[{'content': 'Which of the following is homogenously pink staining extracellular fibrillar protein on congo red staining? \nSelect and explain. \nA. Elastin, B. Amyloid, C. Collagen, D. Actin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Amyloid * Congo red is most specific and most commonly used stain stain used for amyloidosis. Appearance of amyloid (fibrillary" \'extracellular protein) are:-a) Congo red stain on light microscopy: Pink or red color to tissue deposits.b) Congo red stain on polarized microscopy: Apple green birefringence.', 'role': 'assistant'}]