A 5 year old child was admitted with history of feeling tired and lethargic all the time, bleeding gums and sore throat since the last 3months. Exam: hepatosplenomegaly. What is the most probable diagnosis?

The key is A. ALL. [Commonest leukemia in children is ALL. Bleeding gums (low platelet), feeling tired and lethargic, sorethroat, hepatosplenomegally all are well known features of ALL. Acute lymphoblastic leukaemia (ALL) is a type of blood cancer that starts from young white blood cells called lymphocytes in the bone marrow. Adults and children can get it but it is most often diagnosed in younger people. Chemotherapy is the main treatment. Some people need to have a stem cell transplant].