"The color of the elephant is gray."

[bonbayel]

This was expected to be one of the answers: Ο ελέφαντας είναι γκρι.
Normally we're supposed to stick closely to the given sentence. This version doesn't have the word color, and in other situations would have been marked wrong.

[bonbayel]

When I retried it, Ο ελέφαντας είναι γκρι was not accepted. You lose if you do and lose if you don't!

[jaye16]

Ο ελέφαντας είναι γκρι. should be accepted I see it in the incubator. Which section did you encounter it in?
In the tree or a strengthen skill etc?

[bonbayel]

I encountered it in one of the activities where you select "one or more". The first time I just selected the version above with χρώμα, and it was marked wrong because I didn't select the second version. Then at the end of that session (which was probably strength building) I learned from my errors and selected both, which was also marked wrong. Or maybe I selected some trick response accidentally?