Question

His wife makes a final test of Odysseus' identity by getting him to tell

about the building of his bed
the name or his favorite dog
about the day he went away
how he got a scar on his arm

Answer 1

The answer is about the building of his bed.
He built the bed around an olive tree that was growing where the bedroom was situated, and he even incorporated the tree into the bed; therefore moving the bed is an impossible feat.

Answer 2

Answer: About the building of his bed