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"What's your mother's maiden name?"

"42_red_banana_&"

This is why I choose random but plausible answers.

"Mother's maiden name? Cruz-Valdez"

"First Concert? Lil' Mermaid"

"City you were born in? Ubuntu"

The way I usually do this is with the random article button on Wikipedia, until I find something that sounds plausible.

1password team, integrate this feature please