Which disorder is commonly diagnosed in childhood?

Attention Deficit Hyperactivity Disorder (ADHD) is indeed commonly diagnosed in childhood, making it the correct choice. ADHD is characterized by persistent patterns of inattention, hyperactivity, and impulsivity that can significantly impact a child's social, academic, and family life. Symptoms typically manifest before the age of 12 and can continue into adolescence and adulthood, but the diagnosis often occurs during the elementary school years when children start to face structured academic demands.

The other disorders listed have different diagnostic timelines and characteristics. Antisocial Personality Disorder is not typically diagnosed until the individual is at least 18 years old, as it requires a history of conduct disorder in childhood or adolescence. Obsessive-Compulsive Disorder can occur in childhood but is more commonly diagnosed in later childhood to early adulthood, and its symptoms can present differently in children. Borderline Personality Disorder usually appears in late adolescence or early adulthood, as the emotional regulation and sense of self that characterize the disorder are still developing in younger children. Thus, ADHD stands out as the disorder that is most frequently identified during childhood.