Which one of the following is mismatched?

Options

A. Slightly movable joint-vertebrae
B. Hinge joint-hip
C. Synovial joint-elbow
D. Immovable joint-sutures in cranium

Explanation

To determine which of the following pairs is mismatched, we will analyze each pair of joint types and their corresponding examples.

### Step-by-Step Solution:

1. **Identify the Joint Types and Examples**:
- **Slightly Movable Joint**: This type of joint allows limited movement. An example is the vertebrae in the spine.
- **Hinge Joint**: This joint allows movement in one plane. The example given is the hip joint.
- **Synovial Joint**: This is a type of joint that allows for a wide range of motion. An example is the elbow.
- **Immovable Joint**: These joints allow no movement. An example is the sutures of the cranium.

2. **Analyze Each Pair**:
- **First Pair (Slightly Movable Joint - Vertebrae)**: This is a correct match as vertebrae are indeed slightly movable joints.
- **Second Pair (Hinge Joint - Hip)**: This is incorrect. The hip joint is a ball-and-socket joint, not a hinge joint. A correct example of a hinge joint would be the elbow.
- **Third Pair (Synovial Joint - Elbow)**: This is a correct match as the elbow is a synovial joint.
- **Fourth Pair (Immovable Joint - Sutures of Cranium)**: This is also a correct match as sutures of the cranium are immovable joints.

3. **Conclusion**: The mismatched pair is the second one: Hinge Joint - Hip.

### Final Answer:
The mismatched pair is **Hinge Joint - Hip**.

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