Which of the following disorders is characterized by persistent and repetitive nail biting or thumb sucking?

Correct Answer: C

Rationale: Nail biting (C) is a disorder defined by repetitive nail biting or thumb sucking, often a nervous habit. Temper tantrums (A) involve outbursts, delinquency (B) law-breaking, and aggressiveness (D) hostility, none of which match the description.

Correct Answer: B

Rationale: Conduct disorder (B) includes persistent stealing as a rule-violating behavior, per DSM-5. Anxiety (A), depression (C), and PTSD (D) don’t typically feature theft.

Correct Answer: C

Rationale: Persistent sadness (C) is a major symptom of childhood depression, per DSM-5. Hyperactivity (A) is ADHD, elevated mood (B) contradicts, and none (D) is incorrect.

Correct Answer: B

Rationale: Severe food restriction (B) is a hallmark of anorexia nervosa, per DSM-5, causing significant weight loss. Weight gain (A) and uncontrollable eating (C) contradict.

Correct Answer: A

Rationale: Frequent injuries (A) are a red flag for abuse, per child protection guidelines. Happiness (B) and academics (C) don’t indicate abuse.