Answer: C. Class III angina
Explanation: Class III angina refers to severe angina, which is a symptom of coronary heart disease where the patient has a marked limitation of physical activity. Angina occurs when the oxygen-rich blood supply to the heart muscle is inadequate, often due to the narrowing of coronary arteries. Severe angina (Class III) indicates a higher level of risk for significant coronary heart disease because it implies that the patient experiences marked limitations in physical activity or even at rest due to chest pain or discomfort related to their heart condition.
Factors like LDL values, blood pressure, and obesity can contribute to the risk of coronary heart disease, the presence of severe angina (Class III) is a more direct indicator of the disease's severity and the associated risk.