## Core Concept
A trained dai, also known as a traditional birth attendant, plays a crucial role in providing maternal and child health services, especially in rural or underserved areas. The population coverage for a trained dai is an important aspect of public health planning.

## Why the Correct Answer is Right
The correct answer is based on the standard norms for the coverage of a trained dai. According to the World Health Organization (WHO) and various national health policies, a trained dai is expected to cater to a population of 1000-1200. This number ensures that the dai can provide adequate care and support to pregnant women and newborns within a manageable and accessible area.

## Why Each Wrong Option is Incorrect
* **Option A:** 500 is lower than the standard norm, implying a more intensive coverage than required.
* **Option B:** 2000 seems too high for a single dai to manage effectively, potentially compromising the quality of care.
* **Option D:** 5000 is significantly higher than the standard norm and would likely be unsustainable for a dai to provide adequate care.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the role of a trained dai is critical in areas with limited access to healthcare facilities. Knowing the population a dai can effectively cover is essential for health program planning and implementation.

## Correct Answer: C. 1000-1200.