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Radiopaque caries are described as:

  1. RadioLucent

  2. Radiolucent

  3. RadioOpaque

  4. OpaqueRadi

The correct answer is: RadioOpaque

Radiopaque caries are described by the term "radiopaque" because they appear opaque or white on a dental X-ray. This is in contrast to radiolucent caries, which appear transparent or dark on an X-ray. Option A - RadioLucent - is incorrect because the correct term is Radiolucent with a capital "L." Option B - Radiolucent - is incorrect because radiopaque caries are characterized by opacity, not translucency. Option D - OpaqueRadi - is incorrect because the correct term is Radiopaque, not OpaqueRadi.