In this task, you need to provide the correct option for a given problem from the provided options.

Example Input: Problem: one lady has 2 children , one of her child is boy , what is the probability of having both are boys 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 1 / 5 , e ) 3 / 4
Example Output: a

Example Input: Problem: how many zeros does 1000 ! end with ? 
Options: a ) 20 o , b ) 24 o , c ) 249 , d ) 30 o , e ) 325
Example Output: c

Example Input: Problem: what is the value of ( log 2 3 ) ( log 3 4 ) ( log 4 5 ) . . . ( log 63 64 ) ? 
Options: a ) 1 / 6 , b ) 2 , c ) 5 / 2 , d ) 6 , e ) 32
Example Output:
d