**Core Concept**
Cytochrome oxidase (Complex IV) is an essential enzyme in the mitochondrial electron transport chain, playing a crucial role in the process of cellular respiration. It catalyzes the transfer of electrons from cytochrome c to molecular oxygen, resulting in the formation of water and the generation of a proton gradient.

**Why the Correct Answer is Right**
The correct answer is **B. Iron and Copper**. Cytochrome oxidase contains two types of metal ions: iron (Fe) and copper (Cu). The iron is present in the form of heme groups, which are responsible for binding oxygen and facilitating the transfer of electrons. The copper ions are also essential for the enzyme's activity, as they help to stabilize the oxygen binding site.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct metals involved in cytochrome oxidase. While it is true that the enzyme contains metal ions, the specific metals are iron and copper.

**Option C:** This option is incorrect because it lists a different metal, manganese, which is not a component of cytochrome oxidase.

**Clinical Pearl / High-Yield Fact**
One important fact to remember is that the inhibition of cytochrome oxidase can lead to a decrease in ATP production, resulting in cellular dysfunction and potentially life-threatening consequences.

**Correct Answer:** B. Iron and Copper