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What are the three main layers of the hair shaft?

  1. Cuticle, cortex, and medulla

  2. Dermis, epidermis, and follicle

  3. Root, bulb, and papilla

  4. Stratum corneum, lucidum, and granulosum

The correct answer is: Cuticle, cortex, and medulla

The three main layers of the hair shaft are cuticle, cortex, and medulla. The cuticle is the outermost layer of the hair shaft and is responsible for protecting the inner layers from damage. The cortex is the middle layer and contains the pigment that gives hair its color. The medulla is the innermost layer and helps with the hair's structure and flexibility. Option B is incorrect because the dermis and epidermis are layers of the skin, not the hair shaft. Option C is incorrect because while the root, bulb, and papilla are part of the hair follicle, they are not layers of the hair shaft itself. And option D is incorrect because the stratum corneum, lucidum, and granulosum are layers of the skin, not the hair shaft.