"The color of the elephant is gray."
Translation:Το χρώμα του ελέφαντα είναι γκρι.
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?
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?