Which of the following sickle cell crises is the hallmark of sickle cell anemia?

Question

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The hallmark of sickle cell anemia is the painful or vaso-occlusive crisis, which is characterized by severe pain in the affected body part due to disrupted blood flow caused by sickled RBCs. Hemolytic crisis involves accelerated destruction of red blood cells and aplastic crisis is due to reduced production of red blood cells. While both can occur in sickle cell patients, they are not specific to sickle cell anemia.

Which of the Following Sickle Cell Crises Is the Hallmark