Depression is a mood disorder. All of the other choices represent anxiety disorders.

Hypochondriasis is a disorder in which people perceive the presence of an illness when there is none. This is a type of somatoform disorder.

A somatoform disorder is a condition in which a patient experiences physical symptoms that cannot be explained by a medical or neurological diagnosis. Individuals with body dysmorphic disorder (BDD) become fixated upon their actual or imagined physical flaws. Individuals with pain disorders experience physical pain that is triggered by psychological distress. These physical manifestations of psychological symptoms constitute somatoform disorders.

Narcolepsy is a chronic sleep disorder characterized by sudden sleep attacks, as well as overwhelming drowsiness.

Sleep apnea is a sleep disorder characterized by pauses in breathing or infrequent breathing during sleep. Night terrors are episodes of screaming, intense fear, and flailing while still asleep. Often compared to nightmares, night terrors are much more intense. Insomnia is a sleep disorder characterized by difficulty falling and/or staying asleep.

Generalized anxiety disorder (GAD) is unrelated to autism spectrum disorder. GAD is an anxiety disorder characterized by chronic anxiety with no known triggers. 

Derived from the opium poppy, opiates, including heroin and morphine, are used to relieve pain and elevate moods. While heroin is strictly an illegal, recreational drug, morphine is often used in medical treatment for patients in intense physical distress.

While people suffering from agnosia are still capable of hearing, seeing, feeling, smelling and tasting new stimuli, their brains are unable to process that information into a recognizable experience.

While autism presents as a relative indifference to emotional and social context, those that display autistic tendencies can still benefit from exposure to social normality and emotional closeness. Many people with autism may prefer and enjoy their own company, it is not a universal characteristic of those diagnosed with autism. In fact, they may need more social or emotional support than their peers in order to learn how to interact with people and enjoy a more connected life in society.

A general characteristic of autism is that those diagnosed are much less likely to seek out emotional or social support, as compared to those without the disorder.  

Antisocial personality disorder is characterized by a long-standing disregard for the rights and feelings of others. Although this disorder has roots in childhood and adolescence, only adults over the age of eighteen can be given an official diagnosis of antisocial personality disorder. The other answer choices can all be diagnosed in children as young as three years old.

Substance dependence, or drug addiction, refers to continuing use of a drug despite severe costs. It results from a combination of biological and environmental factors. Impulsivity, for example, is rooted in a person's genetic makeup. Cultural norms, familial values, and pure circumstance also play key roles. Self-medication refers to a person's tendency to use alcohol or other substances to cope with physical pain or mental illness.