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': 'The condition which characteristically shows bone infarcts is: \nSelect and explain. \nA. Iron deficiency anaemia, B. Thalassemia, C. Sickle cell anaemia, D. Hereditary spherocytosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bone marrow infarcts are frequent causes of pain in sickle cell anaemia. The heads of the femur and humerus are susceptible to avascular necrosis, a potential source of constant pain and disability. Ischemic bone becomes susceptible to bacterial osteomyelitis. Joint effusions and occasionally hemahrosis may be seen adjacent to infarcted bones. Ref: Kato G.J., Gladwin M.T. (2005). Chapter 108. Sickle Cell Disease. In J.B. Hall, G.A. Schmidt, L.D. Wood (Eds), Principles of Critical Care, 3e.', 'role': 'assistant'}]