Statements: All medicines are drugs. No drug is a food. Which conclusion follows?
Correct answer: B. No medicine is a food
- A. Some medicines are foods
- B. No medicine is a food
- C. All foods are drugs
- D. Some drugs are medicines only
Explanation
Medicines lie inside drugs, and drugs are wholly excluded from foods, so medicines are excluded as well. The exclusion inherited by a subset is the key move in every syllogism of this shape. The third option illegitimately reverses a negative premise.
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About Syllogisms
Syllogisms use categorical statements such as all, some and no to establish relationships between groups. Questions require checking whether conclusions necessarily follow from the premises, often by mental set relationships or Venn diagrams, and distinguishing valid deductions from conclusions that are merely possible.
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