Which group comprises of single celled eukaryotes only ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific group that consists solely of single-celled eukaryotes. This means we are looking for a classification that includes organisms with a membrane-bound nucleus and is unicellular.

2. **Identifying the Classification System**: In biological classification, organisms are grouped into kingdoms. One of the widely accepted systems is the five-kingdom classification system.

3. **Identifying the Relevant Kingdom**: In the five-kingdom classification, the kingdom that includes only single-celled eukaryotes is known as "Protista."

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