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
A patient presented with splenomegaly, anemia & shows reticulocytosis with increased bone marrow cellularity. The diagnosis is: 
Select and explain. 
A. Pernicious anemia, B. Hemolytic anemia, C. Myelofibrosis, D. Hairy cell leukemia
B: Hemolytic anemia
Answer: B: Hemolytic anemia 
Explanation: 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