The capacity to differentiate colours lies in

Options

A. Cones
B. Rods
C. Pigment epithelium
D. Ganglion cell layer

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the capacity to differentiate colors, which relates to the function of specific cells in the eye.

2. **Identifying the Options**:
- **Option 1: Cones** - These are photoreceptors that operate in bright light and are responsible for color vision.
- **Option 2: Rods** - These photoreceptors function in dim light but do not contribute to color vision.
- **Option 3: Retinal Pigment Epithelium** - This layer supports photoreceptors but is not directly involved in color differentiation.
- **Option 4: Retinal Ganglion Cells** - These cells process visual information but do not directly differentiate colors.

3. **Analyzing the Functions**:
- **Cones** are specialized for detecting color and are active in well-lit conditions.
- **Rods** are more sensitive to light but only detect shades of gray, not colors.
- **Retinal Pigment Epithelium** serves a supportive role and does not detect color.
- **Retinal Ganglion Cells** transmit visual information but do not perform color differentiation.

4. **Conclusion**: Based on the analysis, the cells responsible for color differentiation are the **cones**.

5. **Final Answer**: The capacity to differentiate colors lies in **Option 1: Cones**.