In which of the following, only cone cells are found?

Options

A. Fovea centralis
B. Retina
C. Fossa ovalis
D. Blind spot

Answer

To solve the question "In which of the following, only cone cells are found?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Cone Cells**: Cone cells are photoreceptor cells in the retina that are responsible for color vision and function best in bright light conditions. They are primarily concentrated in the fovea centralis.

2. **Analyzing the Options**:
- **Option 1: Fovea Centralis**: The fovea centralis is the central region of the retina where cone cells are densely packed. It is responsible for sharp central vision. Therefore, this option contains only cone cells.

- **Option 2: Retina**: The retina contains both rod and cone cells. Rods are responsible for night vision, while cones are responsible for daylight vision. Thus, this option is incorrect as it does not contain only cone cells.

- **Option 3: Fossa Ovalis**: The fossa ovalis is a depression in the right atrium of the heart and has no relation to photoreceptor cells. Therefore, this option is irrelevant to the question.

- **Option 4: Blind Spot**: The blind spot is the area on the retina where the optic nerve exits the eye, and it contains no photoreceptor cells (neither rods nor cones). Hence, this option is also incorrect.

3. **Conclusion**: Based on the analysis, the only option that contains only cone cells is **Option 1: Fovea Centralis**.

### Final Answer:
The correct answer is **Fovea Centralis**.