## Core Concept
Effective leprosy control programs aim to reduce the transmission of leprosy, prevent disabilities, and improve the quality of life for those affected. Indicators of effective control programs include a decrease in the number of new cases detected, a decrease in the number of cases with disabilities, and an increase in the proportion of cases detected with early symptoms.

## Why the Correct Answer is Right
The correct answer, , is indicative of an ineffective leprosy control program. A high rate of detection of leprosy cases with disabilities suggests that the program is not effectively detecting and treating cases early, leading to a higher number of individuals developing disabilities.

## Why Each Wrong Option is Incorrect
* **Option A:** A decrease in the number of new cases detected is an indicator of an effective leprosy control program, as it suggests that transmission is decreasing.
* **Option B:** An increase in the proportion of cases detected with early symptoms is an indicator of an effective leprosy control program, as it suggests that cases are being detected and treated early.
* **Option C:** A decrease in the number of cases with disabilities is an indicator of an effective leprosy control program, as it suggests that cases are being detected and treated early, preventing the development of disabilities.

## Clinical Pearl / High-Yield Fact
A key indicator of an effective leprosy control program is the **"Detection of cases with early symptoms"**. This is because early detection and treatment can prevent disabilities and reduce transmission.

## Correct Answer: D.