A husband can also be the spouse of another husband, this is heteronormative and invisibilizes the LGBT community.
Pasangan can also be 'partner'
What an idiotic sentence
true but not something one would say often
This sentence would never be said in the English language as the word 'husband' implies that there is or has been a wife.
Lol. It's not really about whether it would be said or not; its about making sure you understand the concept. So this sentence reinforces both words' meaning and helps to make connections to the other words to help you remember in more than one way.
A husband is the spouse of a wife
"A husband is the spouse to a wife" should also be correct.
It would be great if Duolingo had editors to remove silly sentences like this and replace them with ones that people actually use.