Why is answer spelled with a w?

The word "answer" is spelled with a w because of its etymological roots. It comes from the Old English word andswarian, which itself is a combination of and (meaning "one") and swarian (meaning "to swear").

Over time, the w in andswarian evolved into the s we see today in "answer," but the spelling remained consistent.

So, it's not a matter of choice or logic, but rather a consequence of the word's historical journey through language evolution.