## **Core Concept**
The National Blindness Control Program (NBCP) in India aims to prevent and control blindness through a multi-faceted approach, including cataract surgery, distribution of low-cost spectacles, and promotion of eye health. The program has received assistance from various international and national organizations. One of the key partners in this effort has been the **World Health Organization (WHO)** and other international agencies.

## **Why the Correct Answer is Right**
The correct answer, **C. World Health Organization (WHO)**, is right because WHO has been instrumental in providing technical assistance, guidelines, and support for the implementation of the National Blindness Control Program. WHO's involvement includes promoting eye care as part of its global health initiatives and providing resources for disease prevention and control.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because, although several national and international NGOs might be involved in eye care, the question specifically seeks an organization known to assist in the development of the national program.
- **Option B:** Similarly, this option is incorrect as it does not specify a known major contributor to the NBCP.
- **Option D:** This option is incorrect because, while several organizations might contribute to aspects of eye care, WHO is specifically known for its role in global health policy and assistance.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the National Blindness Control Program was launched in 1976 and has undergone several revisions to improve eye care services in India. International collaborations, especially with WHO, have been crucial in shaping and implementing these programs.

## **Correct Answer:** . World Health Organization (WHO)