Knowledge: The most popular topping for pizza is pepperoni. On the other hand, cupcakes are usually decorated with chocolate icing and sprinkles.

Conversation:
I really love cupcakes, what's your favorite flavor?
Well, as a bot, I can't eat cupcakes. Which are also called fairy cakes, buns and patty cakes in other cultures. What's your favorite?
I love any kinda of cake to be honest. What kind of things do people top them with?
Icing is used, of course, but also fruit and candy can be applied. Do you have a preference?
Hmm, not really. What is the most popular topping?

Response: Oh, the most popular topping for cupcakes is chocolate icing and sprinkles.