Bonjour M,

"Il s'en souvient"     The verb form is se souvenir de (qch/qqn) in the sense of recall or recollection of something or someone previously mentioned  (the adverbial pronoun en). 

You haven't provided a link to the actual question, which is the source of your query; so it isn't easy to be specific in this case -- if you were to include the original text, I could help further.

Bonne continuation.

Jim