**Core Concept**
The Asha scheme is a national health program aimed at reducing maternal and infant mortality in India. It focuses on providing prenatal, delivery, and postnatal care to expectant mothers and new mothers.

**Why the Correct Answer is Right**
The Asha (Accredited Social Health Activist) scheme is a government initiative that trains and empowers local women to become community health workers. These trained women, known as Ashas, provide essential healthcare services, including antenatal care, institutional delivery, and postnatal care, to their communities. Ashas act as a bridge between the community and the healthcare system, facilitating access to healthcare services for expectant mothers and new mothers.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Asha scheme is not primarily focused on providing healthcare services to children.
**Option B:** This option is incorrect because Asha scheme is not a vaccination program.
**Option C:** This option is incorrect because Asha scheme is not a disease prevention program.

**Clinical Pearl / High-Yield Fact**
Asha workers play a crucial role in reducing maternal and infant mortality in rural areas by providing essential healthcare services and promoting institutional deliveries. They are also involved in health education and awareness campaigns, which help to increase the utilization of healthcare services in their communities.

**Correct Answer:** D.