49.下列何者是子宮根除術(radical hysterectomy)最常見的慢性併發症? (A)輸尿管陰道瘻管(ureterovaginal fistula) (B)形成淋巴囊腫(lymphocyst formation) (C)腸阻塞(bowel obstruction) (D)膀胱低張症(bladder hypotonia)