## Core Concept
The "3 by 5" initiative is a global plan launched by the World Health Organization (WHO) and UNAIDS to expand access to antiretroviral therapy (ART) for people living with HIV/AIDS. The initiative aimed to provide ART to 3 million people in low- and middle-income countries by the end of 2005.

## Why the Correct Answer is Right
The "3 by 5" initiative focused on scaling up ART in resource-limited settings. The correct answer, **3 million people by 2005**, reflects the primary goal of this initiative, which was to provide antiretroviral therapy to a specific number of people living with HIV/AIDS within a set timeframe. This goal was an ambitious effort to address the gap in treatment access for those in need.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately reflect the goals or achievements of the "3 by 5" initiative.
- **Option B:** This option is incorrect as it does not align with the specific targets set by the "3 by 5" initiative.
- **Option D:** This option is incorrect because it does not match the details of the "3 by 5" initiative.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the "3 by 5" initiative was a significant public health effort to increase access to antiretroviral therapy for individuals with HIV/AIDS in low- and middle-income countries. The initiative's focus on expanding treatment access underscored the global commitment to addressing the HIV/AIDS epidemic.

**Correct Answer: C. 3 million people by 2005**