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What condition is characterized by an increase and enlarged curvature of the nail?

  1. Kolionychia

  2. Onychia

  3. Onychatrophia

  4. Onychorgryphosis

The correct answer is: Kolionychia

Kolionychia is the correct answer because it is a condition that specifically refers to an increase and enlargement of the curvature of the nail. Onychia is incorrect because it refers to inflammation or infection of the nail bed, not curvature. Onychatrophia and Onychorgryphosis are also incorrect because they refer to nail atrophy and curvature in the opposite direction, respectively. Therefore, A is the best answer to the question.