Frank put the medicine on the shelf to make sure it would not be ______ to the kids. [ ]

A. available

B. suitable

C. possible

D. familiar

先天性胆管囊性扩张症可发生在（）。

A.肝内胆管

B.肝外胆管

C.肝内胆管和肝外胆管均可发生

D.胰管

E.胆囊管