The correct answer is SKIN
The skin is the organ system that protects against water and disease and also controls your body temperature. The skin is the outer protective layer of the body of any animal. It is the largest organ of the body.
The skin is divided into two layers: The epidermis and dermis. The epidermis is the outermost layer of the skin. It provides a barrier between the body and the external environment.
The epidermis is further divided into five layers: Stratum corneum, Stratum lucidum, Stratum granulosum, Stratum spinosum, and Stratum basale.
The dermis is the layer underneath the dermis. It contains connective tissues, hair follicles, sweat glands, and extracellular matrix.