A disease that destroys the dorsal horn cells of the spinal cord is:

Options

A. Polio
B. Malaria
C. Leprosy
D. Arhritis

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for a disease that destroys the dorsal horn cells of the spinal cord.

2. **Understand Dorsal Horn Cells**: Dorsal horn cells are part of the spinal cord that are involved in processing sensory information and are crucial for motor function.

3. **Consider Possible Diseases**: We need to think about diseases known to affect the spinal cord, particularly those that impact motor neurons.

4. **Research Poliomyelitis**: One prominent disease that affects the spinal cord is poliomyelitis (commonly known as polio).

5. **Mechanism of Polio**: Polio is caused by the poliovirus, which specifically targets and invades motor neurons in the spinal cord, particularly those located in the dorsal horn.

6. **Impact of Polio**: The viral invasion leads to the destruction of these motor neurons, resulting in muscle weakness and paralysis in affected individuals.

7. **Conclusion**: Since poliomyelitis is known to destroy the dorsal horn cells of the spinal cord, it is the correct answer to the question.

8. **Final Answer**: The disease that destroys the dorsal horn cells of the spinal cord is poliomyelitis (polio).