Hi, Could anyone please help me with this question, as I cannot figure it out. "4 drugs produce the same therapeutic effect by the same mechanism, but each has a unique toxicity. When used at a maximally effective dose, the drug with which of the following sets of characteristics is most likely to have the highest incidence of toxicity?" Median effective dose Toxic dose1/Effective dose99 A) 0.5x 2.8 B) 1x 2.1 C) 5x 4.0 D) 33x 3.0 I know the right anwer is B, but why? I simply cannot remember how to calculate this, so please, could anyone tell me how to (ie. the equation or whatever).