Rocky Mountain Fever is spread by

Options

A. Tick
B. Housefly
C. Cockroach
D. Mosquito.

Answer

### Step-by-Step Solution:

1. **Understanding the Disease**: Rocky Mountain Fever is a disease characterized by symptoms such as sudden onset of moderate to high fever, severe headache, fatigue, deep muscle pain, chills, and body rash.

2. **Identifying the Vector**: The disease is specifically spread through the bite of an infected tick. Ticks are known vectors for various diseases, including Rocky Mountain Fever.

3. **Evaluating the Options**: The question provides four options:
- A) Tick
- B) Housefly
- C) Cockroach
- D) Mosquito

4. **Analyzing Each Option**:
- **Tick**: This is the correct answer as it is the known vector for Rocky Mountain Fever.
- **Housefly**: Incorrect, as houseflies do not transmit this disease.
- **Cockroach**: Incorrect, as cockroaches are not vectors for Rocky Mountain Fever.
- **Mosquito**: Incorrect, as mosquitoes are not responsible for spreading this disease.

5. **Conclusion**: Based on the analysis, the correct answer is A) Tick.