7.發炎性大腸疾病(inflammatory bowel disease)包括克隆氏症(Crohn's disease簡稱CD)和潰瘍性腸炎(ulcerative colitis簡稱UC)，容易有腸道以外的表現(extraintestinal manifestation)。下列何種腸道外表現較常見於CD？(1)pyoderma gangrenosum (2)ankylosing spondylitis (3)primary sclerosing cholangitis (4)episcleritis (5)peripheral arthritis
(A)(1)+(2)+(3)
(B)(2)+(3)+(4)
(C)(3)+(4)+(5)
(D)(2)+(4)+(5)
(E)(1)+(3)+(4)