"Which one is bigger?"

Translation: Ποιο είναι μεγαλύτερο;

[chrysaphi]

Does this always have to be neuter?

[Isidor868839]

I agree. "Which one" could also mean (greek) masculina or even feminina.

[MarsTheSoap]

More alternative translations have been added. Thank you for your suggestions.

[iokasimov.m]

The same problem here: https://forum.duolingo.com/comment/22421942 - Duolingo doesn't accept masculine nouns.

[MarsTheSoap]

More alternative translations have been added. Thank you for your suggestions.