Task: Question Answering
Input (English): Problem: a patient is given exactly 750 milliliters of a mixture of two medications daily . medication a contains 40 % pain killer and medication b contains 20 % pain killer . if the patient receives exactly 215 milliliters of pain killer daily , how many milliliters of medication b are in the mixture ? 
Options: a ) 150 , b ) 225 , c ) 325 , d ) 425 , e ) 550
Output (English): d