Which pigment is responsible for the yellow hue in skin tone?

Carotene is the pigment responsible for the yellow hue in skin tone. This pigment is found in various fruits and vegetables, especially those that are orange or yellow, such as carrots and sweet potatoes. When ingested, carotene can accumulate in the skin, leading to a yellowish tint, particularly noticeable in individuals with lighter skin tones or those with a diet high in carotene-rich foods.

Melanin, on the other hand, is the pigment primarily responsible for skin color and provides protection against ultraviolet radiation. Oxyhemoglobin and hemoglobin are related to the oxygen transport in the blood and influence the redness of the skin but do not contribute to a yellow hue. Thus, carotene is distinctly associated with the yellow pigmentation observed in the skin, making it the correct answer in this context.