**Core Concept**
Lifestyle modification is a crucial aspect of preventive medicine, where healthcare providers counsel patients to adopt habits that reduce their risk of developing chronic diseases. This approach emphasizes the importance of individual behavior change in maintaining overall health and well-being.

**Why the Correct Answer is Right**
The correct answer, **C. Health Education**, refers to the process of advising patients on lifestyle modifications to prevent disease. Health education involves providing patients with accurate information about their health status, risk factors, and the benefits of adopting a healthier lifestyle. This can include advice on diet, exercise, smoking cessation, and stress management. By empowering patients with knowledge and skills, healthcare providers can help them make informed decisions about their health.

**Why Each Wrong Option is Incorrect**
**Option A:** Primary Prevention is a broader concept that encompasses all measures taken to prevent disease before it occurs. While lifestyle modification is a key aspect of primary prevention, it is not the specific mode of intervention being referred to in this question.

**Option B:** Secondary Prevention involves early detection and treatment of disease to prevent complications and improve outcomes. While secondary prevention is crucial in managing chronic diseases, it does not focus on advising patients to change their lifestyle to prevent disease.

**Option D:** Tertiary Prevention aims to reduce the impact of an ongoing illness or injury that has lasting effects. While lifestyle modification may be a component of tertiary prevention, it is not the primary focus of this mode of intervention.

**Clinical Pearl / High-Yield Fact**
Remember that Health Education is a critical component of preventive medicine, and healthcare providers should regularly counsel patients on lifestyle modifications to reduce their risk of chronic diseases.

**Correct Answer:** C. Health Education