Knowledge: Oysters in particular contain one of the highest concentrations of zinc per serving among all food. However, Hemoglobin is made up of iron which is a crucial component for its function.

Conversation:
My favorite color is red.
Oh, OK. Were you aware red is at one end of the spectrum of visible light?
Yes. I like how it's bold and solid. I also like blue, though.
Ah, that one lies between green and violet.
I see, I like red cause it is the color of blood.
Did you know that blood is red because of hemoglobin?
Oh. Really? I never knew that. What does it contain?

Response: Hemoglobin is made up of iron which is a vital component for its function.