Which of the following diseases can be effectively prevented through immunization?

Immunization is a critical public health tool that effectively prevents certain infectious diseases by stimulating the body’s immune response to specific pathogens. Influenza is a viral infection that can cause severe respiratory illness and complications, particularly in vulnerable populations such as the elderly or those with underlying health conditions. The influenza vaccine is designed to elicit an immune response that prepares the body to fight the virus, significantly reducing the incidence of the disease and its related complications.

On the other hand, conditions such as hypertension, stroke, and hyperlipidemia are chronic non-communicable diseases. These conditions are influenced by various risk factors including lifestyle, diet, genetics, and other health behaviors, rather than being caused by infectious agents that can be targeted through vaccination. Therefore, while management and prevention strategies exist for these conditions, they do not involve immunization as a preventive measure. This distinction highlights why influenza is the correct answer, as it is specifically preventable through vaccination, unlike the other listed diseases.