This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplastic disorders of WBCs, Subject name: Pediatrics
A 5-year-old child presents with history of fever off- and-on for past 2 weeks and petechial spots all over the body and increasing pallor for past 1 month. Examination reveals splenomegaly of 2 cm below costal margin. The most likely diagnosis is: 
Select and explain. 
A. Acute leukemia, B. Idiopathic thrombocytopenic purpura, C. Hodgkin's lymphoma, D. Aplastic anemia
A: Acute leukemia
Answer: A: Acute leukemia 
Explanation: - Pallor (anemia), petechial spot (thrombocytopenia), fever (infection due to neutropenia) with splenomegaly suggest the diagnosis of acute leukemia. - Splenomegaly eliminates aplastic anemia - Presence of anemia and recurrent infections, go against ITP