Answer:
Urate crystals can be demonstrated with (d) alizarin red.
Step-by-step explanation:
Alizarin red is a histological staining method that can be used to demonstrate the presence of calcium and urate crystals in tissues. This staining technique involves treating tissue sections with a solution of alizarin red, which binds to calcium and urate crystals and produces a red or orange color.
Rhodanine is used to demonstrate ferric iron, potassium ferrocyanide is used to demonstrate ferrous iron, and methenamine silver is used to demonstrate chromaffin cells.