$\textbf{Answer}$

Neither, because the yolk of egg is yellow.

$\textbf{Note}$

First, this is a brain teaser, not an English grammar test. Realizing this can help you stay on the right track. The point (or trap) in this problem is not to assume the given choices are the only possible choices. There can be another choice.

Framing one's opponent with a few carefully designed choices is a common debate technique. The key to respond to such a set up is not to constrain yourself by these given choices, but to carefully examine their validity.