**Question:** All of the following may lead to plaque formation except –

A. Eating a balanced diet rich in fruits and vegetables
B. Engaging in regular physical exercise
C. Smoking cigarettes
D. Maintaining optimal blood pressure levels

**Core Concept:** Plaque formation is a key pathological process in atherosclerosis, a major cause of cardiovascular diseases like coronary artery disease, stroke, and peripheral artery disease. Plaque formation occurs when there is an imbalance between the production and removal of fatty deposits in the arterial walls.

**Why the Correct Answer is Right:** In this scenario, we are looking for factors that do not contribute to plaque formation. A balanced diet rich in fruits and vegetables provides essential nutrients and reduces inflammation, which helps prevent plaque development. Regular physical exercise reduces inflammation, improves blood circulation, and maintains a healthy weight, all of which aid in plaque prevention.

**Why Each Wrong Option is Incorrect:** Option C, smoking, is harmful as it increases inflammation, impairs the removal of fatty deposits, and promotes arterial narrowing, accelerating plaque formation. Maintaining optimal blood pressure levels (Option D) is crucial for cardiovascular health, but it does not directly prevent plaque formation.

**Clinical Pearl / High-Yield Fact:** Atherosclerosis is not solely caused by dietary choices or inactivity. Other risk factors, such as hypertension, diabetes, and genetic predisposition, also play significant roles. A multifactorial approach to lifestyle modifications is essential for plaque prevention.

**Correct Answer:** C. Smoking (nicotine, carbon monoxide, and toxic chemicals in cigarettes contribute to arterial inflammation and narrowing)

Explanation: The correct answer is smoking (Option C) because it directly promotes arterial inflammation, impedes the removal of fatty deposits, and contributes to arterial narrowing. Smoking causes endothelial dysfunction, increases blood viscosity, and promotes platelet aggregation, all of which contribute to plaque formation and progression.

In contrast, a balanced diet, regular exercise, and maintaining optimal blood pressure levels are essential components of a healthy lifestyle, but they do not directly prevent plaque formation. Instead, they contribute to overall cardiovascular health and reduce the risk of atherosclerosis.