Which among the following are called the Darwin's finches?

Options

A. Archaeopteryx
B. Pteranodon
C. Pavo cristatus
D. Geospiza

Answer

To answer the question "Which among the following are called the Darwin's finches?", we will analyze each option provided:

1. **Archaeopteryx**: This organism is known as a connecting link between reptiles and birds. It is not a finch and is extinct.

2. **Pteranodon**: This is a genus of pterosaur, often referred to as flying reptiles. It lived during the late Cretaceous period and is not related to finches.

3. **Pavochrystatus**: This is the scientific name for the Indian peafowl, commonly known as the peacock. It is not a finch.

4. **Geospiza**: This is a genus of birds that are endemic to the Galapagos Islands. These birds are collectively known as Darwin's finches because Charles Darwin studied them during his visit to the Galapagos Islands, and they are a classic example of natural selection.

From the analysis, the correct answer is **Geospiza**, which are known as Darwin's finches.

### Step-by-Step Solution:
1. **Identify the options**: Look at the four options provided: Archaeopteryx, Pteranodon, Pavochrystatus, and Geospiza.
2. **Analyze each option**:
- Archaeopteryx is a link between reptiles and birds.
- Pteranodon is a flying reptile from the late Cretaceous period.
- Pavochrystatus refers to the peacock, not a finch.
- Geospiza is a genus of birds native to the Galapagos Islands.
3. **Determine the correct answer**: Since Geospiza is the only option that refers to birds known as Darwin's finches, it is the correct answer.

### Final Answer:
The correct answer is **Geospiza**.