This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Which statement about macrophages is FALSE? \nSelect and explain. \nA. They help in processing and presenting antigen to immunocompetent cells, B. They act as mediators in ceain cell-mediated immune reactions, C. They can have Fc receptors, D. They can produce immunoglobulins', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Macrophages are crucial effectors and effectors of immunity. They can produce soluble factors to influence the growth and function of lymphoid and nonlymphoid tissue, as well as responding to ceain lymphokines. Plasma cells, derived from B-lymphocytes secrete immunoglobulin and not macrophages. Ref: Fundamental Immunology By William E. Paul, Page 19', 'role': 'assistant'}]