Bacteriology is the study of:

• A. Toxins
• B. Disease
• C. Bacteria
• D. Personal hygiene

Answer: (C)

Bacteriology is the study of bacteria—the microscopic, single-celled organisms that can be harmless or cause infections. In this field you learn what bacteria look like, how their cells are built, how they grow and reproduce, and how they interact with humans. This knowledge is essential for understanding how infections happen and how to prevent them through proper hygiene, sanitation, and disinfection—especially in settings like salons where infection control matters. Toxins are substances some bacteria produce, and toxicology would study those; disease refers to illness in a broader sense and involves many pathogens and mechanisms beyond just bacteria; personal hygiene is about practices to prevent contamination, not the study of bacteria itself. So the subject directly focused on bacteria is bacteria.