Which of the following has magnesium?

Options

A. Vitamin`-B_(12)`
B. chlorophyll
C. Haemocyanin
D. Carbonic anhydrates

Explanation

To determine which of the given options contains magnesium, we will analyze each option one by one.

### Step 1: Analyze Vitamin B12
- **Chemical Formula**: The chemical formula of Vitamin B12 is C60H88CoN14O14P.
- **Elements Present**: It contains cobalt (Co) but does not contain magnesium (Mg).
- **Conclusion**: Vitamin B12 does not have magnesium.

### Step 2: Analyze Fluorophil
- **Chemical Formula**: The chemical formula of chlorophyll (often confused with fluorophil) is C55H72MgN4O5.
- **Elements Present**: Chlorophyll contains magnesium (Mg) as part of its structure.
- **Conclusion**: Fluorophil (assuming it refers to chlorophyll) does contain magnesium.

### Step 3: Analyze Hemocyanin
- **Chemical Composition**: Hemocyanin is a copper-containing protein.
- **Elements Present**: It contains copper (Cu) and does not contain magnesium (Mg).
- **Conclusion**: Hemocyanin does not have magnesium.

### Step 4: Analyze Carbonic Anhydrase
- **Chemical Composition**: Carbonic anhydrase is an enzyme that primarily contains zinc (Zn) and does not typically contain magnesium (Mg).
- **Conclusion**: Carbonic anhydrase does not have magnesium.

### Final Conclusion
- Among the options provided, **Chlorophyll (Fluorophil)** is the only compound that contains magnesium.

### Answer:
The correct option that contains magnesium is **Chlorophyll**.

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