An arthropod without a true head is

Options

A. Bed Bug
B. Louse
C. Butterfly
D. Tick.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for an arthropod that does not have a true head. We need to identify which of the given options fits this description.

2. **Identifying the Options**: The options provided are:
- Option 1: Bed bug
- Option 2: Louse
- Option 3: Butterfly
- Option 4: Tick

3. **Defining a True Head**: A true head in arthropods typically contains a well-defined structure that houses sensory organs, the brain, and mouthparts.

4. **Analyzing Each Option**:
- **Bed Bug**: Bed bugs have a distinct head with sensory organs and mouthparts, so they have a true head.
- **Louse**: Lice also possess a well-defined head structure, indicating they have a true head.
- **Butterfly**: Butterflies are insects with a clear head that contains eyes, antennae, and mouthparts, thus they have a true head.
- **Tick**: Ticks, on the other hand, do not have a true head. Instead, they possess a structure called a capitulum, which contains mouthparts but lacks a true head structure with a brain or eyes.

5. **Conclusion**: Based on the analysis, the only arthropod from the options that does not have a true head is the tick. Therefore, the correct answer is option 4: Tick.

---