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Onychophagy is more commonly known as:

  1. Brittle nails

  2. Ingrown nails

  3. Nail biting

  4. Nail fungus

The correct answer is: Brittle nails

Onychophagy is the medical term for nail biting. Brittle nails (A), ingrown nails (B), and nail fungus (D) are all possible conditions that may occur as a result of nail biting, but they are not the technical term. Additionally, nail biting is a habitual behavior, not a condition, so it is not accurate to refer to it as a medical condition like brittle nails, ingrown nails, or nail fungus.