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: Medicine
[{'content': 'The primary cause of anemia in chronic kidney disease (CKD) is: \nSelect and explain. \nA. Chronic inflammation, B. Iron deficiency, C. Erythropoetin deficiency, D. Diminished red blood survival', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All are causes of anemia in CKD, the primary cause is insufficient production of erythropoetin by the diseased kidneys. Other causes are; Bleeding diathesis Hyperparathyroidism/bone marrow fibrosis Folate or vitamin B12 deficiency Hemoglobinopathy Ref: Harrisons principles of internal medicine, 18th edition, Page: 2316.', 'role': 'assistant'}]