The ED 50 for drugs A, B, C, and D are 10 mg, 50 mg, 100 mg, and 200 mg, respectively. The LD 50 for drugs A, B, C, and D are 100 mg, 150 mg, 500 mg, and 800 mg, respectively

Assuming the lethal dose response functions for all four drugs have the same slope, in general, which drug has the greatest margin of safety?
a. drug A b. drug B c. drug C d. drug D

a