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General Medicine General 060ec0be

A 30-year-old man presents with recurrent flushing, diarrhea, and weight loss. His examination is normal. Lab investigations reveal an elevated urinary 5-hydroxyindoleacetic acid. Which of the following is the most likely diagnosis?

A
phenylketonuria
B
alkaptonuria
C
malignant melanoma
D
carcinoid syndrome

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