Task: Question Answering
Input (English): Problem: in a zoo , the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same 5 years ago . if the increase in the number of cheetahs in the zoo since then is 2 , then what is the increase in the number of pandas ? 
Options: a ) 2 , b ) 3 , c ) 5 , d ) 6 , e ) 15
Output (English): d