75. An adult client tells the nurse that his father died of a massive coronary attack at the age of 65. The nurse should explain to the client that one of the risk factors for coronary heart disease is __ A. High serum level of low-density lipoproteins. B. Low-carbohydrate diets. C. High serum level of high-density lipoproteins. D. Diets that are high in antioxidant vitamins.

The correct answer is A. High serum level of low-density lipoproteins.<br /><br />Explanation: Coronary heart disease (CHD) is a condition where the coronary arteries, which supply blood to the heart muscle, become narrowed or blocked due to the buildup of plaque. One of the major risk factors for CHD is high levels of low-density lipoproteins (LDL) in the blood. LDL is often referred to as "bad cholesterol" because it can build up in the walls of the arteries, leading to atherosclerosis and increasing the risk of heart disease. Therefore, the nurse should explain to the client that high serum levels of low-density lipoproteins are a risk factor for coronary heart disease.