What field studies the body's specific defenses against pathogens, a concept credited to Jenner's work?

• A. Immunology
• B. Microbiology
• C. Pathology
• D. Virology

Answer: (A)

The body's specific defenses against pathogens are studied in immunology. This field looks at how the immune system recognizes invaders, produces targeted responses such as antibodies and T cells, and builds memory to provide lasting protection. Jenner’s work with vaccination helped establish the idea that exposure to a related, milder pathogen can train the immune system to defend against a more dangerous one, laying the foundation for understanding immunity and how vaccines work.

Microbiology focuses on microorganisms themselves, pathology examines disease processes and tissue changes, and virology concentrates on viruses. Immunology is the best fit because it specifically centers on the host's adaptive defenses and how protection against pathogens is developed and maintained.