A 35-year-old female presents with diffuse musculoskeletal pain for 6 months, fatigue, non-restorative sleep, and 14 tender points. Labs including ANA and ESR are normal. What is the diagnosis?
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A
Rheumatoid arthritis
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B
Systemic lupus erythematosus
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C
Fibromyalgia
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D
Polymyalgia rheumatica