Antennae are absent in

Options

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

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks which organism lacks antennae. Antennae are sensory appendages found in many arthropods.

2. **Identifying the Options**: The question implies there are multiple organisms to choose from. Common examples of arthropods include houseflies, mosquitoes, and ticks.

3. **Analyzing Each Option**:
- **Housefly**: Houseflies have a pair of antennae that help them sense their environment.
- **Mosquito**: Mosquitoes also possess antennae, which are important for detecting odors and vibrations.
- **Tick**: Ticks are arachnids, which belong to a different class within the phylum Arthropoda. They do not have antennae.

4. **Conclusion**: Since ticks do not have antennae, the correct answer to the question is "tick".