The ranger's Favored Enemy feature description says:
When you gain this feature, you also learn one language of your choice that is spoken by your favored enemies, if they speak one at all
I am confused. What language options does the PHB give you to choose from?
Are you supposed to choose a respective language from the Languages table (PHB, p. 123)? Or can you pick any language that at least one type of your favored enemies speaks?
For instance, for Fey, do you have to pick Sylvan, or can you choose the Blink Dog language (since Blink Dogs are fey), Aquan or Giant (Sea Hags are fey too), Elvish (since Dryads speak Elvish), etc.?
On the one hand, Aquan/Giant/Elvish are definitely languages "spoken by your favored enemies". On the other hand, the Languages table specifies Fey as the "typical speakers" of the Sylvan language. Also, the latter doesn't work well with the "language of your choice" part, turning the "choice" into a moot point.