In a certain code language, 'book' is coded as 'pencil', 'pencil' is coded as 'mirror', 'mirror' is coded as 'board'. Then what is useful to write on a paper?  Select:
A) 2
B) 6278
C) 277
D) 281
E) 22
We use pencil to write on a paper but here pencil is coded as mirror. So, the answer is mirror.   2nswer:2
<result>A</result>
In a certain code language, 'book' is coded as 'pencil', 'pencil' is coded as 'mirror', 'mirror' is coded as 'board'. Then what is useful to write on a paper?