**Core Concept**
Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by symptoms of inattention, hyperactivity, and impulsivity. The underlying pathophysiology involves alterations in **dopamine** and **norepinephrine** systems in the brain.

**Why the Correct Answer is Right**
The correct answer is related to the long-term outcomes of ADHD. Research suggests that individuals with ADHD are at a higher risk of developing **antisocial behavior** due to difficulties in social interactions and impulsivity. This is because ADHD can affect the development of **executive function** and **social skills**, leading to increased aggression and rule-breaking behavior.

**Why Each Wrong Option is Incorrect**
**Option A:** Schizophrenia is a distinct psychiatric disorder with its own set of risk factors and is not a direct consequence of ADHD.
**Option B:** While individuals with ADHD may be at a higher risk of developing substance use disorders, including **alcoholism**, this is not the most direct consequence.
**Option C:** Intellectual changes are not a typical long-term outcome of ADHD, as the disorder primarily affects attention and behavior rather than intellectual capacity.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that ADHD can have significant long-term consequences, including increased risk of **antisocial personality disorder** and other behavioral problems.

**Correct Answer:** D. Antisocial behaviour