Which one(s) is not cartilaginous fish?

Options

A. Carcharodon (Great white shark), Trygon (Sting ray)
B. Exocoetus (Flying fish), Catla (Katla), Clarias (Magur)
C. Scoliodon (Dog fish)
D. Pristis (Saw fish)

Answer

To determine which of the given options is not a cartilaginous fish, we need to analyze each option based on their classification.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options, and we need to evaluate each one to see if it is a cartilaginous fish or not.

2. **Evaluate Option 1 - Corcoradone (Great White Shark)**:
- The Great White Shark is classified as a cartilaginous fish. Therefore, this option is incorrect for the question asking for a non-cartilaginous fish.

3. **Evaluate Option 2 - Agroceetus (Flying Fish)**:
- The Flying Fish is classified as a bony fish. Its endoskeleton is made of bones, not cartilage. Thus, this option is correct as it is not a cartilaginous fish.

4. **Evaluate Option 3 - Scoliodone (Dogfish)**:
- The Dogfish is also classified as a cartilaginous fish. Therefore, this option is incorrect for the question.

5. **Evaluate Option 4 - Prestis (Sawfish)**:
- The Sawfish is classified as a cartilaginous fish as well. Thus, this option is also incorrect for the question.

### Conclusion:
After evaluating all the options, the only option that is not a cartilaginous fish is **Option 2 - Agroceetus (Flying Fish)**.

### Final Answer:
**Option 2 is the correct answer as it is not a cartilaginous fish.**

---