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
An 8 year old child with acute lymphadenopathy, fever, 20% lymphocytosis indicates the diagnosis of – 
Select and explain. 
A. Infectious mononucleosis, B. ALL, C. Pulmonary Koch's, D. a–hemolytic Streptococcal infection
A: Infectious mononucleosis
Answer: A: Infectious mononucleosis 
Explanation: None