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': 'The key cell types involved in the acquired immunity include all EXCEPT: \nSelect and explain. \nA. B lymphocytes, B. Erythrocytes, C. T lymphocytes, D. Antigen presenting cells (APC)', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The main physiological role of red blood cells (RBCs), or erythrocytes is to transport\xa0gases (O2, CO2) from the lung to the tissues and to maintain systemic acid/base equilibria.\xa0\nIn addition, RBCs are well equipped with antioxidant systems, which essentially contribute to their function and integrity.\nThey are not involved in acquired immunity.', 'role': 'assistant'}]