This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thalassemia, Subject name: Medicine
[{'content': 'A patient presented with splenomegaly, anemia & shows reticulocytosis with increased bone marrow cellularity. The diagnosis is: \nSelect and explain. \nA. Pernicious anemia, B. Hemolytic anemia, C. Myelofibrosis, D. Hairy cell leukemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hemolytic anemia - reticulocytosis with splenomegaly is seen. Skull and skeletal deformities can occur in childhood due to a marked increase in hematopoiesis and resultant bone marrow expansion', 'role': 'assistant'}]