Which of the following is an occupational resiratory disorder

Options

A. emphysema
B. botulism
C. silicosis
D. anthracis

Answer

To determine which of the following is an occupational respiratory disorder, we need to analyze each option provided:

1. **Emphysema**: This is a chronic obstructive pulmonary disease (COPD) characterized by the over-distention of the alveoli with air. It is often caused by long-term exposure to irritants such as cigarette smoke and air pollution. While it can be influenced by occupational exposure, it is not classified strictly as an occupational disorder.

2. **Botulism**: This is a rare but serious illness caused by a toxin produced by the bacterium Clostridium botulinum. It is primarily associated with contaminated food rather than respiratory exposure, making it unrelated to occupational respiratory disorders.

3. **Silicosis**: This is a lung disease caused by the inhalation of silica dust, typically occurring in occupations such as mining, construction, and sandblasting. It is classified as an occupational respiratory disorder due to its direct link to prolonged exposure to silica in the workplace.

4. **Anthracis**: This refers to a disease caused by the bacterium Bacillus anthracis, which primarily affects livestock and can be transmitted to humans. While it can cause respiratory issues if inhaled, it is more commonly associated with cutaneous or gastrointestinal forms and is not classified strictly as an occupational respiratory disorder.

Based on this analysis, the correct answer is **Silicosis** (Option C), as it is specifically linked to occupational exposure to silica dust.

### Step-by-Step Solution:
1. **Identify the options**: Emphysema, Botulism, Silicosis, Anthracis.
2. **Analyze each option**:
- Emphysema is a COPD but not strictly occupational.
- Botulism is foodborne and not respiratory.
- Silicosis is caused by inhaling silica dust in certain occupations.
- Anthracis is primarily an animal disease with respiratory implications but not occupational.
3. **Determine the occupational disorder**: Silicosis is the only option that fits the criteria of an occupational respiratory disorder.
4. **Conclusion**: The answer is Silicosis (Option C).