Multiple choice general knowledge

What substance are nails made of?

  1. Iron

  2. Sodium

  3. Keratin

  4. Caffine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nails are primarily made of keratin, a fibrous structural protein. Keratin is also found in hair and the outer layer of skin. Iron and sodium are minerals, and caffeine is a stimulant compound, not structural components.

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