Opalina lives as endoparasite in the gut of frog, which is

Options

A. (a) uninucleate
B. (b) binucleate
C. (c) multinucleate
D. (d) none of these

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The organism in question is Opalina, which is known to live as an endoparasite in the gut of frogs.

2. **Understand the Structure**: Opalina has a flat shape and is covered by a protective outer layer called a pellicle. This pellicle serves as a protective covering for the organism.

3. **Examine the Nuclei**: The organism is characterized by having multiple nuclei. In the case of Opalina, it has similar-sized nuclei that are distributed throughout its structure.

4. **Determine the Classification**: Opalina belongs to the kingdom Protista, specifically categorized as a heterokont. This classification is important for understanding its biological characteristics.

5. **Conclude the Nucleus Count**: Given that Opalina has multiple nuclei, we can conclude that it is multinucleic. This means that instead of having a single nucleus, it possesses many nuclei within its cellular structure.

6. **Final Answer**: Therefore, the answer to the question is that Opalina is multinucleic.