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
[{'content': "An 8 year old child with acute lymphadenopathy, fever, 20% lymphocytosis indicates the diagnosis of ? \nSelect and explain. \nA. Infectious mononucleosis, B. ALL, C. Pulmonary Koch's, D. alpha-hemolytic Streptococcal", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Infectious mononucleiosis Here the question seems incomplete. Most probably they have asked about atypical lymphocytosis. Infectious mononucleiosis is characterized by classic triad of : Fever, Sore throat, Posterior cervical lymphadenopathy. This classic triad is seen in > 80% of the patients. The W.B.C. count is characteristically increased. Lymphocytosis is demonstrable with 10-20% of them being atypical. The atypical lymphocytes are called Downey cell. These cells have higher cytoplasm to nucleus ratio.", 'role': 'assistant'}]