Which of the following is a respiratory disease?

Options

A. Polio
B. Cancer
C. Emphysema
D. Arthritis

Answer

To determine which of the following options is a respiratory disease, we need to analyze each option provided:

1. **Polio**: This is a viral disease that primarily affects the nervous system. It can lead to paralysis and is not classified as a respiratory disease. Therefore, polio is not the correct answer.

2. **Cancer**: Cancer is a genetic disease caused by changes in gene control and function. It can affect various parts of the body, but it is not specifically a respiratory disease. Thus, cancer is also not the correct answer.

3. **M5-Syma**: This is identified as a type of respiratory disease. The most common cause of M5-Syma is smoking, and it can also be triggered by other respiratory infections and pollutants. Therefore, M5-Syma is indeed a respiratory disease and is the correct answer.

4. **Arthritis**: This is an inflammatory disease that affects the joints, such as the elbows and knees. It does not involve the respiratory system and is therefore not a respiratory disease.

Based on the analysis, the only option that qualifies as a respiratory disease is **M5-Syma**.

### Final Answer:
**M5-Syma** is the respiratory disease among the given options.