【名词&注释】
体外受精(in vitro fertilization)、胆总管(common bile duct)、社会公众(public)、卫生事件(health event)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)、无性生殖(asexual reproduction)、食物中毒事件(food poisoning occurred)
[单选题]左右肝管扩张,胆囊不大,提示梗阻在
A. 胆总管
B. 肝总管
C. 胆囊管
D. Vater壶腹
E. 胰管