Which is correct

Options

A. Joint between adjacent vertebrae is a fibrous joint
B. Decreased level of Progesterone causes osteoporosis in old people
C. Accumulation of uric acid crystals in joints causes inflammation
D. vertebrae is made up of cartilage only

Answer

To determine which statements are correct regarding joints and conditions related to the vertebrae and osteoporosis, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Joint Between Adjacent Vertebrae**:
- The statement claims that the joint between adjacent vertebrae is a fibrous joint.
- **Analysis**: This is incorrect. The joint between adjacent vertebrae is a cartilaginous joint, specifically a symphysis, which allows for slight movement and provides cushioning.
- **Conclusion**: This statement is false.

2. **Decreased Level of Progesterone and Osteoporosis**:
- The statement suggests that a decreased level of progesterone causes osteoporosis in old people.
- **Analysis**: This is also incorrect. Osteoporosis is primarily associated with decreased levels of estrogen, not progesterone. In both males and females, lower estrogen levels can lead to bone density loss.
- **Conclusion**: This statement is false.

3. **Accumulation of Uric Acid Crystals**:
- The statement indicates that the accumulation of uric acid crystals in joints causes inflammation, leading to a condition called gout.
- **Analysis**: This statement is correct. Gout is characterized by the deposition of uric acid crystals in the joints, causing inflammation and severe pain.
- **Conclusion**: This statement is true.

4. **Vertebrae Made Up of Cartilage Only**:
- The statement claims that vertebrae are made up of cartilage only.
- **Analysis**: This is incorrect. Vertebrae are primarily composed of bone, although they have cartilaginous structures (like intervertebral discs) that provide cushioning between them.
- **Conclusion**: This statement is false.

### Final Answer:
- The only correct statement among the options provided is about the accumulation of uric acid crystals causing gout.