According to the World Health Organization (WHO), essential medicines are defined as:

Question

BlackTom AI · Accepted Answer

WHO's definition: essential medicines are those that satisfy the priority health care needs of the population.

1. Relevant knowledge points and concepts
- The World Health Organization (WHO) maintains a Model List of Essential Medicines which guides selection of medicines based on public health relevance.  
- Key selection criteria include disease prevalence, evidence on efficacy and safety, and comparative cost‑effectiveness to ensure availability, affordability, and appropriate use.  
- Essential medicines cover conditions across preventive, acute, chronic, and emergency care as dictated by population needs.

2. Step-by-step reasoning process
- Step 1: Identify the authoritative source: WHO’s Model List and WHO statements define “essential medicines.”  
- Step 2: Extract the core phrase from WHO: medicines that satisfy the priority health care needs of the population.  
- Step 3: Compare each answer option against that definition and selection criteria (public health relevance, efficacy, safety, cost‑effectiveness, and availability).

3. Calculations (if any)
- No numerical calculations are required for this definitional question.

4. Why the correct answer is correct
- “Medicines that satisfy the priority health care needs of the population” exactly matches WHO’s definition: essential medicines are chosen to meet the priority health care needs of a population based on burden of disease and other selection criteria. The Model List is updated to reflect medicines that should be available and affordable to meet those priorities.

5. Why other options are incorrect
- “Expensive, patented drugs primarily used for rare diseases”: Incorrect because essential medicines emphasize public health priority and cost‑effectiveness; rare, high‑cost drugs are typically not classified as essential for the general population.  
- “Medicines that are used in emergencies, such as natural disasters or disease outbreaks”: Incorrect because this is too narrow; essential medicines cover routine, chronic, preventive, and emergency needs, not only emergencies.  
- “Low-cost generic medicines that treat or prevent common acute conditions”: Partially true but incomplete and misleading—essential medicines are not limited to low‑cost generics or only common acute conditions; they include medicines for chronic and preventive care when they meet priority needs.

6. Conclusion
The correct answer is “Medicines that satisfy the priority health care needs of the population,” which matches the provided answer.

According to the World Health Organization (WHO), essential medicines are defined as:Single choice

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