The cartilage making up the lower jaw is known as

Options

A. Dentary
B. Mentomeckelian
C. Meckel's cartilage
D. Angulosplenial

Explanation

To answer the question regarding the cartilage making up the lower jaw, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about the cartilage that forms the lower jaw. In vertebrates, the lower jaw is known as the mandible.

2. **Understand the Cartilage Types**: The lower jaw is primarily formed from a specific type of cartilage during development. In early vertebrates, this cartilage is known as Meckel's cartilage.

3. **Define Meckel's Cartilage**: Meckel's cartilage is a cartilaginous structure that is part of the first pharyngeal arch in embryonic development. It plays a crucial role in the formation of the mandible.

4. **Identify Other Cartilages**: While there are other cartilages associated with the jaw (like the angular and others mentioned), Meckel's cartilage is specifically responsible for the formation of the lower jaw.

5. **Conclusion**: Therefore, the cartilage making up the lower jaw is known as Meckel's cartilage.

### Final Answer:
The cartilage making up the lower jaw is known as **Meckel's cartilage**.

---