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B
dentine
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C
pulp
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D
none of the above
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Solution
The correct option is A enamel The human teeth consist of 3 regions- crown, neck and root. Crown refers to the part that protrudes out of the gums. Neck is surrounded by the gums. Root is embedded in the bone socket. Enamel is the hardest substance of the human body and it is the outer layer of the crown. Dentine is a layer that lies beneath the enamel of the tooth. It has numerous canaliculi passing from the pulp cavity and moving towards the enamel. Dentine encloses the pulp cavity.