Final answer:
Statins are prescribed to help lower LDL cholesterol levels and reduce the risk of heart disease and stroke. They function by inhibiting HMG-CoA reductase, an enzyme involved in producing cholesterol in the body.
Step-by-step explanation:
The correct response to the client's question about why she might need a statin is that statins help lower your LDL cholesterol level. Statins are a class of drugs that target HMG-CoA reductase, an enzyme important for cholesterol synthesis in the body. By inhibiting this enzyme, statins effectively reduce the levels of cholesterol, particularly the 'bad' LDL cholesterol, which is linked with a higher risk of heart disease and stroke. While there are also dietary and lifestyle changes that can help manage cholesterol levels, statins are often prescribed when these measures are not sufficient, or the risk of cardiovascular events is high.