Which substance is the hardest substance in the human body?

A. Lungs
B. Brain
C. Ribs
D. Enamel


Correct Answer: D. Enamel

Detailed About MCQs

Enamel is the thin outer covering of the tooth. Enamel is the hardest tissue in the human body and contains the highest percentage of minerals, 96%, with water and organic material composing the rest.