This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pediatrics
A mother brings her 2-year old boy with sho history of pallor. Examination reveals pallor, petechiae and splenomegaly. Which of the following is the most likely diagnosis ? 
Select and explain. 
A. Thalassaemia, B. Acute leukaemia, C. Hodgkin's lymphoma, D. Idiopathic trombocytopenic purpura
B: Acute leukaemia
Answer: B: Acute leukaemia 
Explanation: clinical presentation in acute leukemia is pallor,petechiae,hepatosplenomegaly Reference: GHAI Essential pediatrics, 8th edition