8. 發炎性大腸疾病(inflammatory bowel disease)包含潰瘍性大腸炎(ulcerative colitis)和克隆氏症(Crohn's disease),這類患者常會合併腸道外表現(extraintestinal manifestation)。下列何項表現在潰瘍性大腸炎較克隆氏症更常見?
(A) pyoderma gangrenosum
(B) ankylosing spondylitis
(C) nephrolithiasis
(D) cholelithiasis
(E) episcleritis