Can anyone show me the fomula under the condition of below ?

Column A1 got a list. List data = A,B,C
Column B1 will get info from another colum according what A1 appear.
Column E1=ABC
Column E2=BCD
Column E3=CDE

If,
A1=A
B1 will get answer from E1
if,
A1=B
B1 will get answer from E2
if,
A1=C
B1 will get answer from E3

Thanks