Children surveyed in cluster sampling for coverage of national immunization programme is:
**Core Concept**
Cluster sampling is a method of sampling in which the population is divided into clusters or groups, and a random sample of these clusters is selected for the study. In the context of national immunization programs, cluster sampling is often used to assess the coverage and effectiveness of vaccination campaigns.
**Why the Correct Answer is Right**
Cluster sampling is particularly useful for assessing immunization coverage in children because it allows for the identification of clusters or areas with low vaccination rates, which can be targeted for additional interventions. This method is also efficient and cost-effective, as it requires fewer resources than individual-level sampling. In addition, cluster sampling can provide a more accurate representation of the population's vaccination status, as it takes into account the social and environmental factors that may influence vaccine uptake.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a sampling method, making it too vague to be a correct answer.
**Option B:** This option is incorrect because it is not a valid sampling method for assessing immunization coverage in children.
**Option C:** This option is incorrect because it is not the correct term for the sampling method being described.
**Clinical Pearl / High-Yield Fact**
When designing a survey to assess immunization coverage, it is essential to use a sampling method that is representative of the population and can identify areas with low vaccination rates. Cluster sampling is a valuable tool for achieving this goal, and its use can inform targeted interventions to improve vaccine coverage.
**Correct Answer:** C. Cluster sampling is an appropriate method for assessing immunization coverage in children.