Q.

Which of the following is the hardest substance in the human body?

A. Bone
B. Enamel
C. Dentine
D. Nail
Answer» B. Enamel
Explanation: Tooth enamel, along with dentin, cementum, and dental pulp is one of the four major tissues that make up the tooth in vertebrates. It is the hardest and most highly mineralized substance in the human body. It has approximately 95% calcium concentration.
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Biology (GK)

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