**Core Concept**
The female health worker plays a vital role in primary healthcare delivery, especially in rural and underserved areas. Their functions are designed to promote maternal and child health, family planning, and disease prevention.

**Why the Correct Answer is Right**
The correct answer includes various responsibilities such as counseling on family planning methods, conducting routine health check-ups, and providing immunizations to children. These tasks are crucial for preventing and controlling infectious diseases, promoting healthy reproductive behaviors, and improving overall maternal and child health outcomes. The female health worker's role is also essential in providing referrals to higher-level healthcare facilities when necessary.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might include tasks that are not typically associated with the primary responsibilities of a female health worker, such as performing surgical procedures or prescribing medications.
**Option B:** While a female health worker may assist with some diagnostic procedures, they are not typically trained or authorized to perform them independently.
**Option C:** This option might include tasks that are not specific to the role of a female health worker, such as administrative duties or research projects.

**Clinical Pearl / High-Yield Fact**
Female health workers are often the first point of contact for women and children seeking healthcare services, making their role critical in promoting health education, disease prevention, and early intervention.

**Correct Answer: D.**