Which term relates to contamination?

• A. Gastrointestinal
• B. Infection
• C. Hygiene
• D. Incidence

Answer: (B)

Contamination means the presence of unwanted microorganisms or substances where they shouldn’t be. When those contaminants include disease-causing microbes that breach defenses and multiply, they lead to infection—the body's response to invading pathogens. So contamination is the setup, and infection is what happens inside the body as a result.

Gastrointestinal is about the digestive system, not the contamination process. Hygiene refers to practices that prevent contamination, not the contamination itself. Incidence is a rate or frequency of occurring cases in a population, not the relation to contamination.