I'm trying to figure out which trading card game is the most popular.  Can you help?
I'm trying to figure out which trading card game is the most popular.  Can you help?
user
Sure, I have some information about trading card games on my database. Which one are you interested in?
assistant
Which ever physical trading card game is the most popular.
user
That depends a lot on the definition of “most popular.”  For example, there is a way to count which card games are most popular based on the number of US retail store sales.  It’s harder to get a good handle on the sales of card games in other countries.
assistant
Give me the name of the card game that is most popular based on US retail sales.
user