Physical dependency is defined as:

Physical dependency refers to the body's adaptation to a substance, leading to a state where the absence of that substance causes physical withdrawal symptoms. This often occurs with substances such as alcohol or drugs, where the body’s chemistry adjusts to the presence of the substance over time. When someone becomes physically dependent, they experience a strong physiological response to avoid withdrawal, including symptoms such as nausea, shaking, sweating, and more if they stop using the substance abruptly.

In contrast, the other options refer to different aspects of substance use or addiction. Mental cravings, social interactions during use, and behavioral patterns describe psychological or social elements of addiction but do not encompass the physical aspects inherent in physical dependency. The distinction is crucial in understanding the complexities of substance use disorders, as treatment may require addressing both physical dependency and other associated factors.