Which clinical manifestation is commonly associated with Infectious Mononucleosis (Mono) in children?

Infectious Mononucleosis (EBV) classic triad: fever, pharyngitis, lymphadenopathy. Additional features include PETECHIAE on the soft palate (pathognomonic), splenomegaly, hepatomegaly, and a maculopapular rash (especially after amoxicillin). Also causes atypical lymphocytosis. Rapid weight gain (A), hypertension (B), and hypoglycemia (D) are NOT features of mono. Petechiae on the palate are a classic finding. C is correct.