Conversation so far:
does hershey's dark chocolate have milk in it
Hershey's Special Dark Chocolate Bar contains the ingredients: sugar, chocolate, cocoa butter, cocoa processed with alkali, milk fat, lactose (milk), soy lecithin, PGPR, emulsifier, vanillin, artificial flavor, and milk.

Question: what is pgpr
Self-contained rewrite: what is pgpr in chocolate