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What defines Actinic keratosis?

  1. Causes a mild ketatolytic action

  2. Pearly, domed shaped nodules

  3. Common premalignant growth, irregular in shape, scaly, red-pink, feels rough

  4. Acute burning, itching rash

The correct answer is: Common premalignant growth, irregular in shape, scaly, red-pink, feels rough

Actinic keratosis is a common premalignant growth on the skin that is characterized by its irregular shape, scaly texture, and red-pink color. It may also feel rough to the touch. This distinguishes it from the other options, as they do not accurately describe the defining characteristics of actinic keratosis. A does not mention any specific characteristics of actinic keratosis, B describes a pearly, domed shape which is not typical of actinic keratosis, and D mentions acute burning and itching which are not common symptoms of actinic keratosis. Therefore, C is the only option that accurately describes the defining features of actinic keratosis.