Why does assq fail when getting quoted value from a property list?

[Cody Goodman]

This returns (urgent . 2) as I'd expect:

(assq 'urgent '((urgent . 2)))

Why does this not return the same?

(let ((lookup (plist-get '(:severity (quote urgent)) :severity)))
              (assq lookup '((urgent . 2))))

Thanks,

Cody