Task: Question Answering
Input (English): Problem: f 1 ( x ) f 1 ( x ) = 2 x - 1 and fn ( x ) = f 1 ( fn − 1 ( x ) ) fn ( x ) = f 1 ( fn − 1 ( x ) ) for n ≥ ≥ 2 . find f 5 ( 2 ) 
Options: a ) 7 , b ) 6 , c ) 78 , d ) 9 , e ) 1
Output (English): a