Which hypersensitivity reaction is delayed (48–72 hours)?

A specific defense mechanism is always activated by:

Which cell type differentiates into plasma cells?

Which hypersensitivity type involves immune‑complex deposition?

The primary function of the lymphatic system is: 

The largest collection of lymphoid tissue in the body is contained within the:

Primary lymphoid organs are where: 

Multiple answers.  Pick all answers that apply. Secondary lymphoid organs are:

Which immune branch provides rapid, nonspecific defense?

Which cell is the most abundant phagocyte in acute inflammation?