How about "Ah bon ?" ?
yeah, why not "ah bon" ?
yep on memrise another app the translation given for really is ah bon
Pourquoi pas "C'est vrai?"
I think that is an entire sentence meaning "Is that true?" where as this is a single word. While the meaning is the same, the words are different.
C'est vrai was accepted on 5-1-16.
This means "truly" not "really".