What is the primary function of melanosomes?

Melanosomes are specialized organelles primarily involved in the production of melanin, the pigment responsible for the color of skin, hair, and eyes. When skin cells, particularly melanocytes, produce melanin, it is stored within melanosomes. This pigmentation plays a critical role in protecting the skin from ultraviolet (UV) radiation damage, as it absorbs and dissipates UV rays. Hence, the correct answer highlights the main function of melanosomes as the producers of melanin, which contributes to the pigmentation of various tissues and provides a protective effect against environmental factors.

The other options reflect functions that melanosomes do not perform, such as regulating body temperature, storing nutrients, or synthesizing proteins.