Answer:
The stain that may be used to demonstrate calcium is the (c) von Kossa silver nitrate stain
Step-by-step explanation:
The von Kossa stain is a histological staining method that is used to demonstrate the presence of calcium in tissues. This staining technique involves treating tissue sections with a solution of silver nitrate, which reacts with calcium ions to produce a black or brown color.
The Gomori chromium hematoxylin stain is used to demonstrate nucleic acids in tissues, while the Fontana-Masson stain is used to demonstrate melanin in tissues. The Schmorl method is used to demonstrate the presence of melanin in tissues.