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: Pathology
[{'content': 'Erythropoietin can be produced by : \nSelect and explain. \nA. Brain, B. Kidney, C. Bone marrow, D. Adipose tissue', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Erythropoietin is a glycoprotein hormone, produced by\xa0the kidney, which increases erythropoietic activity. The\xa0production of erythropoietin is increased in response to reduced oxygen tension in the blood reaching the kidney.\xa0It results in an increase in the number of cells committed\xa0to the erythroid line, reduced maturation time and early\xa0release of erythrocytes from the bone marrow. Erythropoietin mediates the physiological response of the bone marrow to anemia or hypoxia.', 'role': 'assistant'}]