The outer layer of skin is called(a)Dermis(b)Epidermis(c)Plasma(d)Cortex

The outer layer of the skin is called the epidermis.

Here's a breakdown of the options:

(a) Dermis: The dermis is the layer of skin beneath the epidermis, which contains blood vessels, nerves, and connective tissue.
(b) Epidermis: The epidermis is the outermost layer of the skin. It acts as a protective barrier against environmental factors such as pathogens and UV radiation.
(c) Plasma: Plasma is a component of blood, not related to the layers of the skin.
(d) Cortex: The cortex refers to the middle layer of certain structures like hair or plants, not skin.
Therefore, the correct answer is (b) Epidermis.