Statins are lipid-lowering drugs that decrease morbidity and mortality in individuals at elevated risk of cardiovascular disease. They operate by inhibiting \textit{HMG-CoA reductase}, an enzyme critical to hepatic cholesterol synthesis. By diminishing cholesterol production, statins reduce low-density lipoprotein (LDL) cholesterol, often termed "bad" cholesterol, a primary contributor to atherosclerosis and cardiac disease. Option (a) Beta-blockers manage blood pressure and heart rate but do not impact cholesterol levels directly.
Option (c) Antacids neutralize gastric acid for conditions like acid reflux and are unrelated to cholesterol.
Option (d) Antihistamines treat allergic reactions and do not influence cholesterol regulation.
Therefore, the accurate and most fitting choice is (b) Statins.