Which of the following is a prescription stimulant used to treat ADHD?

Adderall is a prescription stimulant commonly used in the treatment of Attention Deficit Hyperactivity Disorder (ADHD). It contains a combination of amphetamine salts that work by increasing the levels of certain neurotransmitters in the brain, particularly dopamine and norepinephrine. This enhancement in neurotransmitter levels helps improve focus, attention, and impulse control in individuals diagnosed with ADHD.

The other options listed are not used for ADHD treatment. Oxycodone is an opioid pain medication used to manage moderate to severe pain. Ativan and Valium are both benzodiazepines primarily prescribed for anxiety and related conditions, not for ADHD. Their pharmacological effects differ significantly from those of stimulants like Adderall, which specifically target attention and hyperactivity symptoms.