Which specialised cells are present for excretion in they phylum platyhelminthes?

Options

A. Collar cells
B. Cnidoblasts
C. Flame cells
D. Nematocysts

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the specialized cells responsible for excretion in the phylum Platyhelminthes.

2. **Analyzing the Options**: The options provided are:
- Collar cell
- Nidoblast
- Flame cell
- Nematocyst

3. **Evaluating Each Option**:
- **Collar Cell**: These are also known as choanocytes and are characteristic of the phylum Porifera (sponges). They are involved in locomotion and food ingestion, not excretion. Therefore, this option is incorrect.

- **Nidoblast**: These cells are specific to the phylum Cnidaria and are involved in protection against predators. They do not play a role in excretion, making this option incorrect as well.

- **Flame Cell**: These cells, also referred to as protonephridia, are indeed characteristic of the phylum Platyhelminthes. They are specialized for excretion and help in the removal of waste products from the body. This option is correct.

- **Nematocyst**: These are specialized cells found in Cnidaria, used for capturing prey and defense. They do not function in excretion, so this option is incorrect.

4. **Conclusion**: The specialized cells responsible for excretion in the phylum Platyhelminthes are the **flame cells**.

### Final Answer:
**Flame cell**

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