Assertion : Fungal cells have eukaryotic structure.
Reason : They lack plastids.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To answer the question regarding the assertion and reason provided, we will analyze both statements step by step.

### Step-by-Step Solution

1. **Understanding the Assertion**:
- The assertion states that "Fungal cells have eukaryotic structure."
- Eukaryotic cells are characterized by having a defined nucleus and membrane-bound organelles. Fungi belong to the kingdom Fungi, which consists of eukaryotic organisms.

2. **Understanding the Reason**:
- The reason states that "They lack plastids."
- Plastids are organelles found in the cells of plants and some other organisms, and they are involved in the synthesis and storage of food. They are essential for photosynthesis, which is why they are present in plants.

3. **Evaluating the Assertion**:
- Since fungi are indeed eukaryotic organisms, the assertion is correct. Fungal cells have a complex structure with a nucleus and various organelles.

4. **Evaluating the Reason**:
- While it is true that fungi lack plastids, this fact alone does not explain why fungal cells are classified as eukaryotic. The absence of plastids is a characteristic that differentiates fungi from plants, but it does not pertain to the eukaryotic nature of fungi.

5. **Conclusion**:
- Both the assertion and the reason are correct statements. However, the reason does not adequately explain the assertion. Therefore, the correct option is that both statements are true, but the reason is not a valid explanation for the assertion.

### Final Answer:
The assertion is true, and the reason is also true, but the reason does not explain the assertion.