## **Core Concept**
Conduct disorder is a psychiatric condition in children and adolescents characterized by a pattern of negative, hostile, and defiant behavior lasting over a period of time. It involves a disregard for the rights of others and major violations of social norms and rules. The diagnosis is made based on a repetitive and persistent pattern of behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated.

## **Why the Correct Answer is Right**
The correct answer includes options that directly relate to the diagnostic criteria for conduct disorder.
- **a) Disregard for right of others**: This is a core feature of conduct disorder, as these children often engage in behaviors that violate the rights of others.
- **b) Doesn't care for authority**: This is also characteristic, as they typically show a lack of respect for authority figures.
- **e) Steals things**: This is an example of a specific behavior (aggression to people and animals, destruction of property, deceitfulness or theft, and serious violations of rules) that can be part of conduct disorder.

## **Why Each Wrong Option is Incorrect**
- **Option c: Backward in studies**: While children with conduct disorder may have academic difficulties, being "backward in studies" is not a specific criterion for diagnosing conduct disorder. It's more related to academic performance than behavioral issues.
- **Option d: Decreased head circumference**: This option refers to a physical growth parameter and is not related to the behavioral criteria for conduct disorder. It might be relevant in discussions of developmental disorders or conditions affecting growth but not conduct disorder.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that conduct disorder can have various presentations, but it often includes a persistent pattern of behavior where the rights of others or societal norms are violated. Early identification and intervention are crucial to prevent long-term negative outcomes. A classic example of conduct disorder behaviors includes bullying, fighting, stealing, and vandalism.

## **Correct Answer: B.**