Which staining reagent is specifically used to visualize goblet cell mucin in tissue sections?

• A. Gill
• B. Harris
• C. Mayer
• D. Weigert

Answer: (A)

Goblet cell mucin is a carbohydrate-rich substance that is visualized with stains that specifically bind mucins. Gill's mucicarmine is a stain designed to bind mucins, making goblet cell mucin appear distinctly pink/red and easy to identify within epithelium. The other reagents listed are hematoxylin formulations used mainly for nuclear staining and do not selectively highlight mucin. So, among these options, Gill is the stain associated with visualizing goblet cell mucin.