**Core Concept:** Coronary heart disease (CHD) is a major cause of morbidity and mortality worldwide, characterized by atherosclerosis and thrombosis of coronary arteries. Primary prevention aims to reduce the risk of developing CHD through lifestyle modifications and targeted interventions.

**Why the Correct Answer is Right:** In the context of primary prevention of coronary heart disease, the correct answer focuses on lifestyle modifications and early intervention to reduce the risk of developing atherosclerosis and thrombosis. Lifestyle changes include maintaining a balanced diet, regular physical activity, smoking cessation, and controlling blood pressure, cholesterol, and diabetes levels. Early interventions like statins, antiplatelet agents, and antihypertensive medications are given to patients with high risk factors to lower the risk of developing CHD.

**Why Each Wrong Option is Incorrect:**

A. This option suggests focusing on treating established CHD, which is secondary prevention. Primary prevention aims to prevent the development of coronary heart disease, not manage its complications.

B. While maintaining a healthy diet is essential in primary prevention, this option emphasizes the need for drugs like statins, aspirin, and beta-blockers, which are used in secondary prevention (managing established CHD) rather than primary prevention.

C. While controlling blood pressure and preventing diabetes are important lifestyle modifications in primary prevention, this option does not specifically focus on early interventions like statins, antiplatelet agents, and antihypertensive medications that are crucial in lowering CHD risk in high-risk individuals.

D. This option discusses the importance of regular exercise, which is a crucial lifestyle modification in primary prevention. However, it does not emphasize early interventions like statins, antiplatelet agents, and antihypertensive medications for high-risk patients.

**Clinical Pearl:** Early detection and intervention for cardiovascular risk factors are crucial in primary prevention of coronary heart disease (CHD). Regular exercise, maintaining a healthy diet, and controlling blood pressure and diabetes are essential lifestyle modifications. Early interventions like statins, antiplatelet agents, and antihypertensive medications should be considered for high-risk individuals to reduce the risk of CHD development.