Unlike subjects such as chemistry, history or linguistics, language as such does not have a specific focus or topic. You can use it to speak about anything, or at least anything that is within the limits of your language skills.
So when you are confronted with the question, "Say something in X", you need to pick something from a vast range of choices that potentially covers everything that exists. This leads to overchoice or choice overload, which Alvin Toffler in 1970 described as follows:
"[Overchoice takes place when] the advantages of diversity and
individualization are canceled by the complexity of buyer's
Simply put, the decision becomes overwhelming because there are too many options. The phenomenon has also been studied in commercial settings. For example, researchers set up a booth with a range of jams in a supermarket and let customers taste some of the jams and choose one. The choice is a lot easier when fewer types of jam are available. (See also The Jam Study Strikes Back: When Less Choice Does Mean More Sales.)
In the case of foreign languages, the solution can be simple: just talk about the languages that you speak and how long you have spent learning each of them.