**Core Concept**
The concept of multipurpose workers refers to a healthcare model where a single worker is trained to provide a range of basic healthcare services, including maternal and child healthcare, family planning, and immunization. This approach aims to increase access to healthcare services, particularly in rural or underserved areas where resources may be limited.

**Why the Correct Answer is Right**
The concept of multipurpose workers was first introduced by the World Health Organization (WHO) and the United Nations Children's Fund (UNICEF) as a strategy to improve healthcare delivery in developing countries. Multipurpose workers are trained to provide a range of services, including antenatal care, delivery assistance, postnatal care, immunization, and family planning. They are often the first point of contact for communities and play a critical role in promoting health and preventing disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Not Applicable - This option is not relevant to the concept of multipurpose workers.
**Option B:** Not Applicable - This option is not relevant to the concept of multipurpose workers.
**Option C:** Not Applicable - This option is not relevant to the concept of multipurpose workers.

**Clinical Pearl / High-Yield Fact**
The concept of multipurpose workers has been shown to be effective in increasing access to healthcare services, particularly in rural areas. They can help to improve health outcomes, reduce maternal and child mortality, and promote healthy behaviors.

**Correct Answer:** C.