Asked to name the body's largest organ, you might picture something tucked inside your chest or abdomen. The answer is much easier to see: your skin. It covers your body, but its job goes far beyond being an outer wrapper.
Skin helps keep germs out and fluids in. It also gives you a sense of touch, allowing you to notice pressure, texture and temperature. Those familiar sensations are part of the work this large organ does throughout the day.
Temperature control is another important task. Skin helps your body manage heat, and it takes part in making vitamin D. The quiz's answer is therefore more than a surprising name: it points to a protective, responsive organ you use constantly, even when you are hardly thinking about it.
Sources: NIAMS: Learning About Skin