**Disability Indicators**
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### Core Concept

Disability is defined as any restriction or inability to perform an activity in the manner or within the range considered normal for a human being. Indicators of disability are used to assess the need for rehabilitation services or accommodations. The World Health Organization (WHO) International Classification of Functioning, Disability and Health (ICF) framework is widely used to categorize and assess disability.

### Why the Correct Answer is Right

The correct answer is **A. Normal range of motion**. Normal range of motion does not necessarily indicate disability, as an individual can have a normal range of motion and still experience functional limitations or difficulties performing daily activities. Disability indicators typically assess an individual's ability to perform daily activities, work, or participate in social roles, rather than just their physical mobility.

### Why Each Wrong Option is Incorrect

* **Option B:** Activity limitation is a key indicator of disability, as it assesses an individual's ability to perform daily activities, work, or participate in social roles.
* **Option C:** Participation restriction is also an indicator of disability, as it evaluates an individual's ability to participate in social roles and activities.
* **Option D:** Environmental factors, such as inaccessible buildings or transportation, can contribute to disability by limiting an individual's ability to participate in daily activities or access necessary services.

### Clinical Pearl / High-Yield Fact

When assessing disability, it's essential to consider the ICF framework, which includes body functions and structures, activity, and participation. This framework helps healthcare professionals and rehabilitation specialists identify the underlying causes of disability and develop effective treatment plans.

### Correct Answer: A. Normal range of motion