What is the opposite of husband?

English Grammar Tests, Elementary Level

ESL/EFL Test #257 [color=blue]“Noun and Verb Opposites (3)”, question 5

Unfortunately, my husband and my friend’s don’t get along.

(a) wife
(b) man
© joke
(d) couch

English Grammar Tests, Elementary Level

ESL/EFL Test #257 [color=blue]“Noun and Verb Opposites (3)”, answer 5

Unfortunately, my husband and my friend’s wife don’t get along.

Correct answer: (a) wife

Your answer was: [color=red]incorrect
Unfortunately, my husband and my friend’s man don’t get along.
[size=200]_________________________[/size]

Why I can’t chose “man”. It seems my husband and my man are the same thing for me.

Informally, a husband or boyfriend can be called someone’s man. This, however, is looking for opposites. The opposite of “husband” is not “man” but “wife.”