Problem: A 42-year-old man presents for a follow-up visit. A history of present illness reveals worsening bitemporal headaches associated with nausea and occasional vomiting. He denies any visual disturbances, jaw claudication, or joint pain. His medical history includes chronic migraines, hypertension, and chronic kidney disease. His daily medication is lisinopril. The vital signs are normal. On physical examination, he has excellent bilateral temporal artery pulses without tenderness. The findings of the musculoskeletal examination are unremarkable. Laboratory testing shows normal CBC and liver function tests. Creatinine is 1.8 mg/dL. An erythrocyte sedimentation rate (ESR) is 45 mm/hr, and C-reactive protein (CRP) is 0.1 mg/dL. What best explains his ESR and CRP levels? Looking for Assignment Help? A. Giant cell arteritis B. Polymyalgia rheumatica C. Chronic kidney disease D. Migraine headaches