An 18-year-old man presents for a screening physical exam to join his college freshman lacrosse team. He reports no medical problems, and he does not take any medications. Physical exam is unremarkable. His immunizations are current, and he denies sexual activity or smoking. Review of routine labs reveals an elevation in unconjugated bilirubin. His total bilirubin level 4 mg/dL. Liver enzymes, serum electrolytes, complete blood count, and conjugated bilirubin level are within normal limits.What is the most likely diagnosis?

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