单项选择题

A.胃镜(gastro intestinal fiberscope ,GIF )
B.十二指肠镜(jejunum fiberscope,JF)
C.支气管镜(cysto fiberscope ,CY )
D.鼻咽喉镜(ear and nose fiberscope,ENF)
E.气管插管镜(laryngo fiberscope ,LF )