Lateral line occurs in

Options

A. Star fish
B. Jelly fish
C. Dog fish
D. All the above

Answer

To answer the question "Lateral line occurs in," we need to analyze the options provided and understand what the lateral line system is and which organisms possess it.

### Step-by-Step Solution:

1. **Understanding the Lateral Line System**:
- The lateral line system is a sensory organ found in aquatic vertebrates, particularly in fishes. It helps them detect vibrations and pressure changes in the water, aiding in navigation, hunting, and avoiding predators.

2. **Analyzing the Options**:
- **Option 1: Starfish**:
- Starfish belong to the phylum Echinodermata. They do not possess a lateral line system. Therefore, this option is incorrect.
- **Option 2: Jellyfish**:
- Jellyfish belong to the phylum Cnidaria (formerly known as Coelenterata). They also do not have a lateral line system. Hence, this option is incorrect as well.
- **Option 3: Dogfish**:
- Dogfish are a type of shark that belongs to the class Chondrichthyes (cartilaginous fishes). They do possess a lateral line system, making this option correct.
- **Option 4: All of the above**:
- Since options 1 and 2 are incorrect, this option is also incorrect.

3. **Conclusion**:
- The correct answer is **Option 3: Dogfish**, as it is the only organism listed that possesses the lateral line system.

### Final Answer:
The lateral line occurs in **Dogfish** (Option 3).