Cytochrome is a

Explanation-

In the mitochondria of plant and animal cells, cytochrome is a carrier molecule containing the Fe porphyrin ring.
Cytochrome participates in the electron transport chain during oxidation reaction.
Cytochrome is proteins with a heme group and Fe at the center as a co-factor.


Final Answer-

So, The correct answer is B.
Cytochrome is a - Fe porphyrin ring.