40.下圖a、b、c、d均為123I甲狀腺影像,圖a為正常甲狀腺影像,圖c可能為下列何種診斷?(A)格雷夫氏症(Graves disease)(B)甲狀腺機能低下(hypothyroidism)(C)自主性高功能甲狀腺結節(autonomous hyperfunctioning adenoma)(D)亞急性甲狀腺炎(subacute thyroiditis)