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The correct answer for your question will be letter D (callus)
Callus is the hardening of epidermal tissue in a specific spot. The correct option is D.
What is callus?
A callus is a thickened and even sometimes hardened area of skin that generates as a consequence of repeated friction, pressure, or other irritation.
Calluses are most commonly found on the feet and hands due to the repeated contact required, but they can occur anywhere on the skin.
Callus is the hardening of epidermal tissue in a specific spot.
Thus, the correct option is D.
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