Correct Option: A

LD₅₀ (Lethal Dose 50) is the amount of a solid or liquid material that it takes to kill 50% of test animals (for example, mice or rats) in one dose. LD50 is one way to measure the short-term poisoning potential (acute toxicity) of a material. LC₅₀ is the concentration of a material in air that will kill 50% of the test subjects when administered as a single exposure.