**Core Concept**
The National Protocols and Initiatives for Combating Trafficking in Persons, particularly women and children, are essential components of social and preventive medicine. Ujjwala is a key initiative aimed at combating a specific form of exploitation and abuse.

**Why the Correct Answer is Right**
Ujjwala is a scheme specifically designed to combat child trafficking, which involves the recruitment, transportation, transfer, harbouring, or receipt of a child for the purpose of exploitation. This initiative focuses on providing support and assistance to victims of child trafficking, including rescue, rehabilitation, and reintegration into society. The scheme also aims to strengthen the law enforcement machinery to prevent and investigate cases of child trafficking.

**Why Each Wrong Option is Incorrect**
**Option A:** Child abuse refers to the physical, emotional, or sexual maltreatment of a child, which is a separate issue from child trafficking.

**Option C:** Child labour involves the employment of children in various occupations, often in hazardous conditions, but it is not the primary focus of the Ujjwala scheme.

**Option D:** This option is incorrect as Ujjwala is indeed a scheme aimed at combating a specific form of exploitation.

**Clinical Pearl / High-Yield Fact**
Ujjwala is a critical initiative that highlights the need for a comprehensive approach to combating human trafficking, including awareness, prevention, rescue, and rehabilitation. It also underscores the importance of intersectoral collaboration between law enforcement agencies, social workers, and healthcare providers to address this complex issue.

**✓ Correct Answer: B. Child trafficking**