**Core Concept**
Social and preventive medicine focuses on promoting health and preventing disease through community-based interventions. Effective strategies to change behavior and promote social norms require a multifaceted approach, but ultimately aim to inspire imitation and adoption of positive practices.

**Why the Correct Answer is Right**
Setting an example is a powerful method for increasing awareness and promoting behavioral change, particularly in rural settings where social influence and community norms play a significant role. By demonstrating the benefits of small family norms through personal example, individuals can inspire others to adopt similar practices, fostering a ripple effect that contributes to broader social change. This approach leverages the power of social proof and personal influence to promote positive behavior.

**Why Each Wrong Option is Incorrect**
**Option A:** Film shows can be an effective tool for educating large groups, but they may not have the same level of personal influence as setting an example. While film shows can raise awareness, they may not inspire the same level of behavioral change as seeing a community leader or respected individual adopt small family norms.
**Option B:** Charts and exhibitions can be useful for providing information and raising awareness, but they may not be as effective in promoting behavioral change as setting an example. Visual aids can be engaging, but they lack the personal touch and social influence that comes from observing a community leader or respected individual adopt small family norms.
**Option C:** Role-playing can be a useful tool for educating and raising awareness, but it may not be as effective in promoting behavioral change as setting an example. Role-playing can help individuals practice new behaviors, but it may not inspire the same level of imitation and adoption as seeing a community leader or respected individual adopt small family norms.

**Clinical Pearl / High-Yield Fact**
The most effective behavior change interventions are those that combine education with social influence and personal example. In rural settings, where social norms and community influence play a significant role, setting an example is often the most effective way to promote behavioral change and increase awareness.

✓ Correct Answer: D. Setting on example