Which factor can contribute to noninfectious diseases?

• A. Hereditary factors
• B. Pathogen infection
• C. Transmission between animals
• D. Vaccination

Answer: (A)

Noninfectious diseases come from factors inside the body or inherited traits rather than from pathogens. Hereditary factors are genetic traits passed from parents that can predispose someone to conditions like certain metabolic disorders, heart disease, or some cancers. These diseases arise due to the body's own biology and genetic makeup, not because of an infection.

Pathogen infection causes infectious diseases, not noninfectious ones, even though infections can complicate health. Transmission between animals describes how diseases spread and isn’t a cause of noninfectious disease. Vaccination is a preventive measure that reduces risk of infectious diseases, not a factor that contributes to noninfectious diseases.