Causative organism of whooping cough is

Options

A. Bordetella pertussis
B. Salmonella typhi
C. Vibrio cholerae
D. None of these

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks for the causative organism of whooping cough. This means we need to identify which specific microorganism is responsible for causing this disease.

2. **Reviewing the Options:** The options provided are:
- Bordetella Peltosus
- Salmonella Typhi
- Vibrio Cholerae
- None of these

3. **Analyzing Each Option:**
- **Vibrio Cholerae:** This organism is known to cause cholera, which is characterized by symptoms such as vomiting and diarrhea. Therefore, it is not the causative agent for whooping cough.
- **Salmonella Typhi:** This bacterium causes typhoid fever, an intestinal and blood disease. It does not cause whooping cough.
- **Bordetella Peltosus:** This is the key organism we are looking for. Bordetella Peltosus is known to cause whooping cough. The disease is characterized by severe coughing fits, which is why it is referred to as "whooping" cough.

4. **Conclusion:** After analyzing the options, we conclude that the causative organism of whooping cough is **Bordetella Peltosus**.

**Final Answer:** Bordetella Peltosus

---