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When drugs are grouped together because they help treat a particular disease or condition, which classification system is being used?

  1. Chemical

  2. Mechanism of Action

  3. Pharmacological

  4. Therapeutic

The correct answer is: Chemical

When drugs are grouped together because they help treat a particular disease or condition, a chemical classification system is being used. This means that the drugs are being organized based on their shared chemical structure and properties. Option B, the mechanism of action classification system, focuses on how a drug works rather than its chemical composition. Option C, the pharmacological classification system, categorizes drugs based on their effects on the body. Option D, the therapeutic classification system, categorizes drugs based on the disease or condition they are intended to treat. Therefore, option A is the most appropriate classification system for grouping drugs based on their shared chemical properties.