**Question:** To eradicate measles the percentage of population to be vaccinated is at least ______%:

*Core Concept*: Eradication is the complete elimination of a specific infectious disease from the earth's population. Vaccination is a crucial tool in achieving this goal by reducing the prevalence of the disease in the population.

**Why the Correct Answer is Right:** For measles eradication, the World Health Organization (WHO) recommends achieving at least 95% vaccination coverage in a population. This high vaccination rate ensures that there are insufficient individuals susceptible to the disease, making it difficult for the virus to survive and spread.

**Why Each Wrong Option is Incorrect:**

A. 80%: While vaccination coverage of 80% can help control measles transmission, it is not sufficient to achieve eradication due to the high infectiousness of the virus.

B. 90%: While a vaccination coverage of 90% is better than 80%, it is still not high enough to eliminate measles from the population.

C. 95%: This option is correct as achieving 95% vaccination coverage ensures that a significant proportion of the population is immune to the virus, making it difficult for the disease to persist.

D. 100%: While achieving 100% vaccination coverage theoretically eliminates the disease, it is challenging to achieve complete vaccination coverage in practice.

**Clinical Pearl:** Achieving at least 95% vaccination coverage is essential to eliminate measles from a population. This is a crucial aspect of public health strategies that aim to control and eradicate infectious diseases.

**Correct Answer:** C. 95%