Lepidosiren is

Options

A. Mackeral
B. Sardine
C. American lung fish
D. Pilot fish

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about "Lepidosiren" and provides four options to choose from. We need to identify what Lepidosiren is.

2. **Identifying Lepidosiren**: Lepidosiren is known to be a type of lungfish. Lungfish are unique because they possess both gills and lungs, allowing them to breathe air.

3. **Connecting Link**: Lepidosiren serves as a connecting link between fishes and amphibians. This is due to its fish-like body structure and amphibian-like characteristics, such as the presence of lungs.

4. **Heart Structure**: Lungfish, including Lepidosiren, have a three-chambered heart, which is a characteristic feature that they share with amphibians.

5. **Geographical Distribution**: Lepidosiren is primarily found in South America, which is why it is also referred to as the South American lungfish.

6. **Evaluating Options**: Now, we evaluate the options provided:
- Option 1: Natural - Incorrect
- Option 2: Sardine - Incorrect
- Option 3: Tanker lungfish - This is correct as Lepidosiren is a lungfish.
- Option 4: Pilot fish - Incorrect

7. **Conclusion**: Based on the above analysis, the correct answer is that Lepidosiren is a "Tanker lungfish" (Option 3).

---