Pheromone traps have

Options

A. Sterile males
B. Male pheromones
C. Female pheromones
D. Sterile females

Answer

To answer the question "Pheromone traps have," we need to analyze the options provided and understand the function of pheromone traps.

### Step-by-Step Solution:

1. **Understanding Pheromone Traps**:
- Pheromone traps are devices used to attract insects using chemical signals known as pheromones. These traps are specifically designed to lure certain insects for monitoring or control purposes.

2. **Identifying the Purpose of Pheromone Traps**:
- The primary purpose of these traps is to attract male insects. By doing so, they can prevent these males from mating with females, thereby reducing the population of the target insect species.

3. **Analyzing the Options**:
- **Sterile Males**: This option is incorrect because pheromone traps do not contain sterile males; they are designed to attract males, not to introduce sterile ones.
- **Male Pheromones**: This option is also incorrect as pheromone traps do not use male pheromones to attract insects; they use female pheromones.
- **Female Pheromones**: This option is correct. Pheromone traps typically contain female pheromones that attract male insects.
- **Sterile Females**: This option is incorrect because pheromone traps do not contain sterile females; they are focused on attracting males.

4. **Conclusion**:
- Based on the analysis, the correct answer is that pheromone traps have **female pheromones**.

### Final Answer:
Pheromone traps have **female pheromones**.