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': 'Interferon gamma, which is known to enhance the cytotoxic effects of macrophages are secreted by which of the following components of the immune system? \nSelect and explain. \nA. CD4 T cell, B. CD8 cells, C. RBC, D. Neutrophils', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CD4+ Thl T cells secrete interferon gamma, a cytokine that enhances the cytotoxic potential of activated macrophages. These activated macrophages show increased phagocytic and respiratory activity, along with enhanced antigen presenting capacity.', 'role': 'assistant'}]