Grammar question : using "but" after "everyone"

hi everyone , this question is showed to me strange :S >>

The question:

Everyone ________ albinos has a certain amount of pigment in the skin to add color.
(A) but
(B) that
© without
(D) not

I answered © , but in the answer key it was (A)…

can anyone explain to me ! is this a new use for “but” ?

“but” here means “except”,read the sentences below:

-I couldn’t do anything but sit and wait.
-I had no choice but to accept the challenge.