Immunology is the study of which of the following?

• A. Study of immune response
• B. Process of digestion
• C. Structure of cells
• D. Function of muscles

Answer: (A)

Immunology is the study of how the immune system defends the body. It looks at how the body recognizes foreign invaders, how immune cells like T cells, B cells, and macrophages respond, how antibodies are produced, and how memory provides protection on future exposures. It also covers innate and adaptive immunity, inflammation, and the regulatory processes that keep the response balanced. This focus on the immune response—the sequence of events the body uses to detect and fight pathogens—is what immunology is all about. Topics like digestion, cell structure, and muscle function belong to other areas of physiology, not immunology.