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What lubricates the skin and preserves the softness of the hair?

  1. Sebum

  2. Decayed matter

  3. Chemical hair relaxer or perm

  4. Bodily secretions

The correct answer is: Sebum

Sebum is the correct answer because it is the natural oil produced by the sebaceous glands in the skin. Sebum helps lubricate the skin and hair, preserving the softness of the hair. On the other hand, options B, C, and D are incorrect. Decayed matter, chemical hair relaxer or perm, and bodily secretions do not have the same beneficial effects on the skin and hair as sebum does.