Which of the following has statocyst as balancing organ ?

Options

A. Aurelia
B. Taenia
C. Pleurobrachia
D. Ascaris

Answer

To solve the question "Which of the following has statocyst as a balancing organ?" we will analyze each of the given options: Urelia, Kanyi, Pleurobrachia, and Ascaris.

### Step-by-Step Solution:

1. **Understanding Statocysts**:
- Statocysts are specialized sensory organs that help in maintaining balance and orientation in aquatic organisms. They are primarily found in some invertebrates, including certain mollusks, cnidarians, and echinoderms.

2. **Analyzing the Options**:
- **Urelia**: This is not a commonly recognized organism in the context of statocysts. It does not typically have statocysts as a balancing organ.
- **Kanyi**: Similar to Urelia, Kanyi does not refer to a well-known organism known for having statocysts.
- **Pleurobrachia**: This is a genus of comb jellies (Ctenophora) known to possess statocysts. These organs are located at the aboral end of the organism and help in maintaining equilibrium while swimming.
- **Ascaris**: This is a genus of parasitic roundworms. Ascaris does not have statocysts; instead, it has a different type of sensory structure.

3. **Conclusion**:
- Among the given options, **Pleurobrachia** is the only organism that has statocysts as a balancing organ. Therefore, the correct answer is **Pleurobrachia**.

### Final Answer:
**Pleurobrachia**