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: Physiology
[{'content': 'Among the blood cells, the longest life span is that of: \nSelect and explain. \nA. Neutrophil, B. Eosinophil, C. Lymphocyte, D. Erythrocyte', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lymphocytes enter the circulatory system continually, along with drainage of lymph from the lymph\xa0nodes and other lymphoid tissue. After a few hours, they pass out of the blood back into the tissues by\xa0diapedesis. Then they re-enter the lymph and return to the blood again and again; thus, there is\xa0continual circulation of lymphocytes through the body. The lymphocytes have life spans of weeks or\xa0 months, depending on the body’s need for these cells.\nReference: GUYTON AND HALL TEXTBOOK OF MEDICAL PHYSIOLOGY, THIRTEENTH EDITION(INTERNATIONAL EDITION ) page no 456', 'role': 'assistant'}]