**Core Concept**
The anganwadi worker plays a crucial role in the Integrated Child Development Services (ICDS) program, which aims to improve the nutritional and health status of vulnerable groups, including children, pregnant women, and lactating mothers. Anganwadi workers are community health workers who provide essential services such as nutrition, health education, and immunization to these target groups.

**Why the Correct Answer is Right**
Anganwadi workers are trained to provide a range of services, including nutrition education, health check-ups, immunization, and referral services for pregnant women and children. They also distribute supplementary nutrition to children, pregnant women, and lactating mothers, which helps address malnutrition and related health issues. The ICDS program focuses on the holistic development of children, including their physical, cognitive, and emotional growth.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because anganwadi workers are not primarily responsible for providing medical treatment or conducting surgeries.
**Option B:** This option is incorrect because anganwadi workers are not trained to provide specialized medical services such as obstetrics or pediatrics.
**Option C:** This option is incorrect because while anganwadi workers may provide some support for family planning, it is not their primary role.

**Clinical Pearl / High-Yield Fact**
Anganwadi workers play a vital role in the early detection and referral of malnutrition, which can have long-term consequences for child development and health outcomes. Effective training and support for anganwadi workers are essential to ensure the success of the ICDS program.

**Correct Answer: C. Health and nutrition education, and immunization.**