Yeah, the question is more about definition of an chicken egg: if it's an egg laid by a chicken, no matter what hatches from it, or if it's an egg that a chicken is hatched from, no mater what/who laid it.
I've always felt "belong" being too strong word here. I see "belong" as "must have" instead of "goes well with" but I guess that's just because that's how it's translated in my native language 🤔
