<prompt> What is the diagnosis in this patient with abdominal pain?AmyloidosisFamilial Mediterranean feverLead poisoningLeukemia  <response>: Answer C. Lead poisoningThe blue lines evident on the gums are Burtons lines, which can be present in patients with lead poisoning. The diagnosis of occupational lead poisoning was confirmed by an elevated serum lead level. The patient recovered following chelation therapy. 