This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Viral Infections, Subject name: Pediatrics
An 8 year old boy presented with fever and bilateral cervical lymphadenopathy with prior history of sore throat. There was no hepatomegaly. The peripheral blood smear shows >20% lympho plasmacytoid cells. The most likely diagnosis is: 
Select and explain. 
A. Tuberculosis, B. Infectious Mononucleosis, C. Acute lymphoblastic leukemia, D. Influenza
B: Infectious Mononucleosis
Answer: B: Infectious Mononucleosis 
Explanation: Ans. B. Infectious MononucleosisThe given clinical situation suggests Infectious MononucleosisFeatures of Infectious Mononucleosis:* Cervical Lymphadenopathy* Fever* History of sore throat* >20% atypical lymphocytesHepatomegaly may be absent (Occurs only in 30% of cases)