In toxicology studies, LD50 can be best described as the dose ________
A) at which 50% of an exposed population develops a chronic effect from the toxicant
B) at which 50% of an exposed population develops disease
C) at which more than 50% of the population dies as a result of the toxicant development
D) at which 50% of an exposed population is killed or displays a specific symptom
E) at which at least 50% of the exposed population is not affected by the toxicant
Answer: D
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