What is the stimulus associated with the sense of sight?

The stimulus associated with the sense of sight is light. Vision relies on the detection of light waves that enter the eye and are focused onto the retina at the back of the eye. Photoreceptor cells in the retina, specifically rods and cones, respond to the intensity and wavelength of light, enabling the brain to interpret these signals as visual images.

Each of the other choices pertains to different senses; for instance, sound waves are associated with hearing, temperature relates to the sense of touch, and chemicals in food activate the sense of taste and smell. In contrast, the mechanism of vision is solely dependent on light, making it the correct answer in this context.