Ceruplasmin contains-

**Core Concept**
Ceruloplasmin is a ferroxidase enzyme that plays a crucial role in the metabolism of iron in the body. It is involved in the oxidation of ferrous ions to ferric ions, which are then bound to transferrin for transport to various tissues.

**Why the Correct Answer is Right**
Ceruloplasmin contains six copper atoms per molecule, which are essential for its enzymatic activity. The copper ions in ceruloplasmin are coordinated to a protein matrix and are responsible for the oxidation of ferrous ions to ferric ions. This process is critical for maintaining iron homeostasis in the body. Ceruloplasmin is synthesized in the liver and secreted into the plasma, where it binds to apolipoprotein B and is transported to various tissues.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because ceruloplasmin does not contain zinc. While zinc is an essential trace element that plays a critical role in many biological processes, it is not a component of ceruloplasmin.
**Option B:** This is incorrect because ceruloplasmin does not contain manganese. Manganese is another essential trace element that is involved in various enzymatic reactions, but it is not associated with ceruloplasmin.
**Option C:** This is incorrect because ceruloplasmin does not contain selenium. Selenium is a trace element that is essential for the activity of certain enzymes, but it is not a component of ceruloplasmin.

**Clinical Pearl / High-Yield Fact**
Ceruloplasmin is a sensitive marker for Wilson's disease, a genetic disorder characterized by excessive accumulation of copper in the body. Low levels of ceruloplasmin are often seen in patients with Wilson's disease, which can lead to liver disease, neurological symptoms, and other complications.

**Correct Answer: C. Copper atoms.**