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Which is the outermost and thinnest layer of the skin?

  1. Dermis

  2. Epidermis

  3. Stratum corneum

  4. Hypodermis

The correct answer is: Epidermis

The option A, Dermis, is incorrect because it is the middle layer of the skin and not the outermost layer. Option C, Stratum corneum, is incorrect because while it is the outermost layer of the epidermis, it is not the outermost layer of the skin as a whole. Option D, Hypodermis, is incorrect because it is the innermost layer of the skin and not the outermost layer.