Which is the hardest substance in the human body?

A. Tooth enamel
B. Skull
C. Knee cap
D. Rib

Check Answer

The correct answer is A) Tooth enamel.

Tooth enamel is the hardest substance in the human body. It is a highly mineralized layer that covers the crown of the tooth and protects it from damage and decay. Enamel is composed mainly of hydroxyapatite, a mineral form of calcium phosphate that is highly resistant to acid erosion and physical wear. While the skull, knee cap, and rib are all strong and durable structures, they are not as hard as tooth enamel.
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