Which of the following is a correct statement about the immune system?

• A. Antigens are parts of pathogens that the immune system is unable to identify.
• B. T-lymphocytes are large cells that can ingest pathogens and other infected cells.
• C. Humoral immunity includes the production of B-lymphocytes which produce antibodies.
• D. Innate immune system is the body’s first line of defense and relies on T-lymphocytes.

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the key components of the immune system mentioned in the problem: antigens, T-lymphocytes, and B-lymphocytes.
2. Step 2: Clarify the role of antigens: Antigens are molecules or parts of pathogens that the immune system can recognize and respond to, not something it fails to identify.
3. Step 3: Review the function of T-lymphocytes: These are a type of white blood cell involved in cell-mediated immunity, but they do not primarily ingest pathogens; that role belongs to phagocytes like macrophages.
4. Step 4: Examine humoral immunity: This branch of the immune system involves B-lymphocytes, which produce antibodies that specifically target antigens.
5. Step 5: Conclude that the correct statement is about humoral immunity involving B-lymphocytes producing antibodies, as this accurately describes a fundamental immune response.