6. 82歲男性患者,在半夜睡覺時突然發生左膝蓋劇痛。在急診抽血發現uric acid 6.1 mg//dL, ESR 42 mm/1h, CRP 4.6 mg/dL。關節液檢查:WBC 8480/HPF,發現有 rhomboid and plate-like crystal (+),但無needle-shaped crystal.請問最有可能的疾病診斷為何?
(A) Acute gouty arthritis
(B) Pseudo-gout
(C) Septic arthritis
(D) Osteoarthritis
(E) Polymyalgia rheumatica