The effective dose 50 (ED50) value for Drug A is 2.0 mg/kg, while its lethal dose 50 (LD50) value is 8 mg/kg. Which of the following is true of Drug A?
A. Drug A is ineffective for its intended purpose.
B. Drug A has a therapeutic index of 4.0.
C. The therapeutic index of Drug A is 0.25.
D. The therapeutic index of Drug A is 25.
Answer: B
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