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: Pediatrics
A 5 year old boy comes with overnight petechial spots 2 weeks back he had history of abdominal pain and no hepatosplenomegaly. Diagnosis is ? 
Select and explain. 
A. Aute lymphatic leukemia, B. Aplastic anemia, C. Idiopathic thrombocytopenis purpura, D. Acute viral infection
C: Idiopathic thrombocytopenis purpura
Answer: C: Idiopathic thrombocytopenis purpura 
Explanation: Ans. is 'c' i.e., Idiopathic thrombocytopenic purpura Petechial spots without hepatosplenomegaly in a 5 year old boy suggest the diagnosis of ITP. About other options Acute leukemia o Acute leukemia will give features of involvement of all the three lineages i.e. anemia (erythrocyte involvement) fever (due to neutrophil involvement) bleeding (due to platelet involvement) Moreover splenomegaly and lymphadenopathy are usually present in Acute leukemias. Aplastic anemia o Aplastic anemia too will present with features, characteristic of involvement of all the three lineages i.e. severe anemia, fever bleeding.