Task: Question Answering
Input (English): Problem: the average monthly income of p and q is rs . 5050 . the average monthly income of q and r is rs . 6250 and the average monthly income of p and r is rs . 5200 . the monthly income of p is : 
Options: a ) 4050 , b ) 3500 , c ) 4000 , d ) 4500 , e ) 5000
Output (English): c