Brain teasing puzzle from a pack of cards?

[GreenMonstatmmm]

the white of an egg clever..... I had to think about it for a sec. I was like YOLK! wait...that doesnt sound right. hahahahahah.

 

[jobees]

If Something funny is spelled JOKE,
and people can be spelled FOLK,
how do we spell the white of an egg?
sorry all three of you are wrong

 

[mlaugh4um]

the white of an egg.
its trying to get you to spell yolk, but the yolk is yellow.

kinda dumb

 

[Babyeater]

t-h-e-w-h-i-t-e-o-f-a-n-e-g-g.

 

[Vangorn2000]

Albumin

 

[DB]

A-l-b-u-m-e-n