Under polarised light, the congo red stained amyloid shows-
Pink or red color
White color
Apple green birefringence
Answer- C. Apple green birefringenceAmyloid has an affinity for Congo red stain; therefore this method is used for confirmation of amyloid of all types. If the stained section is viewed in polarised light, the amyloid characteristically shows apple-green birefringence due to cross- b-pleated sheet configuration of amyloid fibrils.The stain can also be used to distinguish between AL and AA amyloid (primary and secondary amyloid respectively).