**Core Concept**
The Anganwadi Services under the Integrated Child Development Services (ICDS) scheme is a government program aimed at providing primary healthcare and nutrition to rural and urban areas. An Accredited Social Health Activist (ASHA) is a key component of this program, serving as a link between the community and the healthcare system.

**Why the Correct Answer is Right**
The ASHA is responsible for providing healthcare services to a population of approximately 1000 individuals, which includes pregnant women, lactating mothers, children, and other vulnerable groups. ASHAs are selected from the local community and undergo training to provide basic healthcare services, including immunization, nutrition, and health education. They act as a bridge between the community and the healthcare system, facilitating access to healthcare services for the population they serve.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the ASHA is not responsible for providing healthcare services to a population of 500 individuals.
**Option B:** This option is incorrect because the ASHA is not responsible for providing healthcare services to a population of 1500 individuals.
**Option C:** This option is incorrect because the ASHA is not responsible for providing healthcare services to a population of 5000 individuals.

**Clinical Pearl / High-Yield Fact**
ASHAs play a crucial role in bridging the gap between the community and the healthcare system, making them an essential component of the ICDS program. They are responsible for promoting health, preventing disease, and providing essential healthcare services to the population they serve.

**Correct Answer:** A. 1000 individuals.