Amphinucleus is?
Synkaryon
Macronuleus
Micronucleus
None of the above.

Options

A. Synkaryon
B. Macronuleus
C. Micronucleus
D. None of the above.

Answer

To determine what an amphinucleus is, let's analyze the options provided:

1. **Understanding Amphinucleus**:
- An amphinucleus is also known as a synkaryon. It refers to a nucleus that contains the chromosomes from two different parent cells. This occurs when two somatic cells (cells that are not involved in reproduction) fuse together, resulting in a single nucleus that has genetic material from both parents.

2. **Evaluating the Options**:
- **Synkaryon**: This is the correct term for amphinucleus, as it describes the fusion of two nuclei from different parent cells into one.
- **Macronucleus**: This is incorrect. A macronucleus is a larger nucleus found in certain protozoans, primarily involved in non-reproductive functions.
- **Micronucleus**: This is also incorrect. A micronucleus is smaller and is involved in reproductive processes, serving as the reproductive nucleus in some organisms.
- **None of the above**: This option is incorrect since we have identified that amphinucleus is indeed a synkaryon.

3. **Conclusion**:
- Based on the definitions and functions of the nuclei discussed, the correct answer to the question "Amphinucleus is?" is **Synkaryon**.

### Final Answer:
Amphinucleus is **Synkaryon**.