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: Radiology
Not a radiological feature of sickle cell anemia 
Select and explain. 
A. Hair on end appearance, B. Bone within bone appearance, C. Diaphyseal or epiphyseal infarct, D. Chondrocalcinosis.
D: Chondrocalcinosis.
Answer: D: Chondrocalcinosis. 
Explanation: Chondrocalcinosis is a feature of Pseudogout.