Mild MR – features are–a) Present in 5–10% populationb) ↑ Incidence in low socioeconomic groupc) Presents in 2 yearsd) Genetic background Present

**Core Concept**
Mild Mental Retardation (MR) is characterized by an Intelligence Quotient (IQ) between 50-69, and is associated with **cognitive impairment** and **adaptive difficulties**. The **etiology** of mild MR is often multifactorial, involving **genetic**, **environmental**, and **socioeconomic factors**.

**Why the Correct Answer is Right**
The correct answer choice includes options that are accurate regarding mild MR, such as its **prevalence in the population**, **socioeconomic correlations**, and **genetic predispositions**. Mild MR is indeed more common in **low socioeconomic groups**, likely due to limited access to **healthcare**, **nutrition**, and **education**. A **genetic background** can also contribute to the development of mild MR.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incomplete and lacks specificity regarding the features of mild MR.
**Option B:** This option is also incomplete and does not provide a comprehensive overview of mild MR.
**Option C:** Presents in 2 years is not a defining characteristic of mild MR, as the condition can present at various ages.

**Clinical Pearl / High-Yield Fact**
Mild MR often goes **unrecognized** until children begin **formal education**, at which point **learning difficulties** become more apparent. It is essential to consider **socioeconomic factors** and **genetic predispositions** when evaluating individuals with mild MR.

**Correct Answer:** D. Genetic background Present