The third name in trinomial nomenclature is

Options

A. Genus
B. Species
C. Subgenus
D. Subspecies

Answer

To answer the question "The third name in trinomial nomenclature is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nomenclature**:
- Nomenclature refers to the system of naming organisms. In biological classification, there are two main systems: binomial nomenclature and trinomial nomenclature.

2. **Binomial Nomenclature**:
- In binomial nomenclature, each species is identified by two names: the first name is the genus, and the second name is the species. For example, in *Homo sapiens*, *Homo* is the genus, and *sapiens* is the species.

3. **Trinomial Nomenclature**:
- Trinomial nomenclature expands on this by adding a third name. This third name can indicate a subspecies or a variety.
- The format is: Genus + Species + Subspecies/Variety.

4. **Identifying the Third Name**:
- In the context of trinomial nomenclature, the third name is typically referred to as the subspecies when discussing animals or as a variety when discussing plants.
- For example, in the case of the Indian crow (*Corvus splendens splendens*), *splendens* is the species, and the third *splendens* again refers to the subspecies.
- In botany, for example, the cabbage is classified as *Brassica oleracea capitata*, where *capitata* is the variety.

5. **Conclusion**:
- Therefore, the third name in trinomial nomenclature is either "subspecies" (for animals) or "variety" (for plants). In the context of the question, the correct answer is "subspecies."

### Final Answer:
The third name in trinomial nomenclature is **subspecies** (or **variety** in botany).

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