Which one of the following is a marine fish ?

Options

A. Rohu
B. Hilsa
C. Catla
D. Common carp

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks to identify which fish is a marine fish from a given list. Marine fish are those that live in saltwater environments, such as oceans and seas.

2. **Classification of Fish**: Fish can be classified based on their habitat into two main categories:
- **Freshwater Fish**: These fish live in freshwater bodies like rivers and lakes. Examples include Rohu, Catla, and Carp.
- **Marine Fish**: These fish inhabit saltwater environments. Examples include Sardines, Hilsa, Mackerel, and Pomfret.

3. **Identifying Marine Fish**: From the examples provided, we can list the marine fish:
- Sardines
- Hilsa
- Mackerel
- Pomfret

4. **Selecting the Correct Answer**: The question specifically asks for a marine fish. Among the options provided, Hilsa is identified as a marine fish.

5. **Conclusion**: Therefore, the correct answer to the question "Which one of the following is a marine fish?" is **Hilsa**.