Name the photosensitive pigment present in the rod cells of the retina.

Photosensitive cells in the retina:

1. The retina forms the light-sensitive region of the eye containing photosensitive cells known as rods and cones.
2. The receptor cells are $140$million in number out of which rods are $130$ million.
3. Rods are sensitive to dim light and are not responsible for seeing color.
4. The pigment present in them is known as rhodopsin.