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
Which of the following are the cause of Anemia in CKD. 
Select and explain. 
A. erythropoietin production deficiency, B. Folic acid  deficiency, C. Decreased erythrocyte Survival, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Other causes :
Iron, B12 deficiency.
Bleeding Diathesis.
Hemoglobinopathy.
Hyperparathyroidism .
Acute and chronic Inflammation.