Our hair and nails contain:

Protein

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Calcium

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Chlorine

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Phosphorus

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Solution

The correct option is A
Protein

The correct option is A.
Explanation of the correct answer:
Our nails and hair are made up of a protein known as keratin.
Keratin belongs to a group of fibrous structural proteins that are known as scleroproteins.
The hair grows in a hair follicle, and nails grow from the matrix i.e., the base of the nail bed.
Explanation of the incorrect options:
Option B:
Our hair and nails do not contain calcium.
Option C:
Our hair and nails do not contain chlorine.
Option D:
Our hair and nails do not contain phosphorus.
Final answer: Our hair and nails contain protein.

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