So as a theoretical or perhaps practical exercise, what lens (focal length wise) is your #1 go-to lens for your 5x7?

As a brief follow-up, you might say why that lens/focal length is your go-to choice.

Thanks in advance!

(the thought occurred that if I could parse all 5x7 images posted to the forum and somehow extract what lens they were shot with, I would have my answer, but that would take some advanced data mining...)