Which of the following is a common sign of opiate withdrawal?

Yawning is a common sign of opiate withdrawal and is often associated with various phases of the withdrawal process. When an individual who has been using opiates suddenly reduces their intake or stops altogether, the body reacts to the absence of the drug that it has grown accustomed to. As a result, the individual may experience various physical symptoms, including yawning, which is typically a reflection of the body's response to stress and discomfort.

During opiate withdrawal, the central nervous system undergoes a rebound effect. Opiates normally suppress certain physiological responses, and when these drugs are no longer present, the body may react with symptoms like yawning, which can indicate an increased state of arousal or hyperactivity in the nervous system. Other common signs of opiate withdrawal may include anxiety, restlessness, muscle aches, insomnia, and gastrointestinal symptoms.

While the other answer choices may also relate to withdrawal or associated conditions, yawning is specifically recognized as a frequent and well-documented symptom of opiate withdrawal.