## Core Concept
The core concept being tested here revolves around the differentiation between substance dependence and substance abuse, focusing on the key features that distinguish dependence from other forms of substance use disorders. Substance dependence is characterized by a pattern of use that leads to significant impairment or distress, with tolerance, withdrawal, and compulsive use being central features.

## Why the Correct Answer is Right
The correct answer, , highlights the presence of **tolerance** and **withdrawal** as key features that differentiate substance dependence from substance abuse. Tolerance occurs when an individual requires increasingly larger doses of a substance to achieve the desired effect, while withdrawal refers to the onset of a characteristic syndrome when the substance is suddenly stopped or reduced in dosage. These physiological adaptations are hallmarks of dependence.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not specifically address the physiological or psychological criteria that distinguish dependence from abuse, such as tolerance and withdrawal.
- **Option B:** This option is incorrect as it focuses on social and occupational consequences, which can be present in both substance abuse and dependence, and does not specifically differentiate between the two.
- **Option C:** This option is incorrect because, although it mentions a pattern of use, it does not specifically highlight the critical features of tolerance and withdrawal that are essential for a diagnosis of dependence.

## Clinical Pearl / High-Yield Fact
A crucial clinical pearl to remember is that the presence of **tolerance and withdrawal** is what primarily distinguishes substance dependence from substance abuse. Clinicians use these criteria, among others, to diagnose substance use disorders according to standardized classification systems like DSM-5.

## Correct Answer Line
**Correct Answer: D. Tolerance and withdrawal.**