## Core Concept
The National Leprosy Control Programme (NLCP) aims to eliminate leprosy as a public health problem through early detection, treatment, and prevention of disabilities. Leprosy, also known as Hansen's disease, is a chronic infection caused by *Mycobacterium leprae* that primarily affects the skin, peripheral nerves, mucosa of the upper respiratory tract, and eyes. The control strategies involve a multi-faceted approach including awareness generation, active case detection, and provision of free treatment.

## Why the Correct Answer is Right
The correct answer involves a comprehensive strategy that includes **Early Detection and Treatment**, which is crucial for preventing disabilities and deformities associated with leprosy. This approach is based on the understanding that leprosy is curable with multidrug therapy (MDT), and early intervention can significantly improve outcomes. The strategy also encompasses **Contact Tracing** to identify and screen individuals who have been in close contact with leprosy patients, as they are at higher risk of developing the disease. **Chemoprophylaxis** may also be considered in certain situations to prevent the development of leprosy in exposed individuals. **Community Participation and Awareness Generation** are vital for encouraging people to come forward for screening and treatment.

## Why Each Wrong Option is Incorrect
- **Option A:** This option might suggest a single-faceted approach or an incomplete strategy that does not fully address the complexities of leprosy control.
- **Option B:** This could imply a passive approach to case detection and treatment, which is less effective in controlling the spread of leprosy and preventing disabilities.
- **Option C:** This might indicate a strategy that focuses on treatment alone, neglecting the importance of early detection, contact tracing, and community involvement.

## Clinical Pearl / High-Yield Fact
A key strategy in the National Leprosy Control Programme is the use of **Multidrug Therapy (MDT)**, which is highly effective in curing leprosy and preventing drug resistance. Another important aspect is the **detection of cases through active and passive surveillance**, aiming to reduce the backlog of undetected cases and prevent further transmission. Early detection and treatment not only cure the disease but also prevent disabilities and deformities, improving the quality of life for patients.

## Correct Answer Line
**Correct Answer: D. All of the above.**