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A 3-year-old boy is brought by his parents to the emergency department because they are concerned that he has had a high fever for several days. On examination, the boy has conjunctival and oral erythema. He has palpable cervical lymphadenopathy and erythems of his palms and soles. What is the most likely diagnosis?

A. Rheumatic fever
B. Kawasaki disease
C. Pneumonia
D. Neonatal sepsis
E. Heart failure