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What is a patch test given to determine?

  1. Hair color levels

  2. A possible sensitivity to aniline derivatives

  3. The percentage of body water

  4. Product service familiarity

The correct answer is: A possible sensitivity to aniline derivatives

The patch test is not used to determine hair color levels, as that can be assessed through other means such as a color consultation with a stylist. It is also not used to measure the percentage of body water, as that can be measured through other methods like a body composition analysis. Lastly, the patch test is not used to assess familiarity with a product or service, as it is specifically designed to determine if a person may have a sensitivity to aniline derivatives. These are chemicals commonly found in hair dyes and other products. Therefore, option B is the correct answer as it provides an accurate explanation of the purpose of a patch test.