Question

LD50 in a toxicity test stands for ______

(a) a dose that will kill 50% of an exposed population

(b) a dose that would not affect or harm 50% of an exposed population

(c) a dose that will kill 25% of an exposed population

(d) a dose that would not kill 25% of an exposed population

I have been asked this question during an internship interview.

This interesting question is from Toxicity Assessment in portion Risk Assessment of Hazardous Waste Management

Answer 1

Correct choice is (a) a dose that will kill 50% of an exposed population

Explanation: The value of LD50 for a substance is the dose required to kill half the participant of a tested population after a specified test duration and it also depends on the rate of exposure.