Q: What is the solid part of your nail that is visible?  

Answer: D

The visible, solid part of the nail is called the nail plate. It is composed of dead skin cells that have been flattened and hardened. The nail plate is made up of several layers of a protein called keratin, which is also found in hair and skin. The nail plate grows from the base of the nail, called the nail matrix, and is pushed forward as new cells are added to the nail.
Incorrect answer options:
A) Cuticle: This is not correct. The cuticle is a thin layer of skin that covers the base of the nail. It helps to protect the nail matrix and keep out bacteria and other harmful substances.
B) Nail bed: This is not correct. The nail bed is the soft tissue underneath the nail plate. It contains blood vessels, nerves, and other structures that help support the nail.
C) Lunula: This is not correct. The lunula is the crescent-shaped area at the base of the nail. It is the visible part of the nail matrix and appears white because it is not covered by the nail plate. While the lunula is an important part of the nail, it is not the solid part that is visible.

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