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