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: Medicine
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 ems below costal margin. The most likely diagnosis is - 
Select and explain. 
A. Acute leukemia, B. Idiopathic thrombocytopenic purpura, C. Hypersplenism, D. Aplastic anemia
A: Acute leukemia
Answer: A: Acute leukemia 
Explanation: None