**Core Concept:** Mental retardation is a term used to describe significant limitations in intellectual functioning and adaptive behavior. The Diagnostic and Statistical Manual of Mental Disorders (DSM) is a classification system used by mental health professionals to diagnose mental disorders. In DSM-V, the term "mental retardation" has been replaced by "intellectual disability."

**Why the Correct Answer is Right:**
In DSM-V, the term "mental retardation" has been replaced to avoid stigmatization and promote a more accurate and inclusive language. The term "intellectual disability" is used to describe individuals with significant limitations in intellectual functioning and adaptive behavior. This term acknowledges that the underlying neurobiological basis of the condition is related to cognitive functions.

**Why Each Wrong Option is Incorrect:**
A. Mental retardation (Option A) is incorrect because it is the old term used in DSM-IV and has been replaced in DSM-V.
B. Intellectual disability (Option B) is incorrect because it is the correct term for the condition but not the one used in DSM-V.
C. "Intellectual impairment" (Option C) is incorrect as it is not the official term provided in the DSM-V.
D. "Developmental disability" (Option D) is incorrect because it is also not the official term used in DSM-V.

**Clinical Pearl:**
The DSM-V classification system reflects a shift towards a more precise and respectful language for conditions affecting cognitive functions. When encountering a patient with intellectual disability, it is crucial to be aware of the changes in terminology to provide accurate and compassionate care for these individuals.