text: <unk>  is a derivative of guanidine.  It is an antihypertensive drug similar to guanethidine.<unk>  is frequently used for phenotyping the CYP2D6 enzyme, a drug metabolizing enzyme.
option_0: Debrisoquine
option_1: Artemether
option_2: Tafenoquine
option_3: Amodiaquine
option_4: Flumequine
option_5: Piperaquine
option_6: Chloroquine
option_7: Dihydroartemisinin