What is the difference between LD50 and LC50?

• A. LD50 is the lethal dose to kill 50% of test animals via ingestion or parenteral exposure; LC50 is the lethal concentration in air or water that kills 50% of test organisms, usually via inhalation or aquatic exposure.
• B. LC50 is the lethal dose to kill 50% of test animals via ingestion or parenteral exposure; LD50 is the lethal concentration in air or water that kills 50% of test organisms, usually via inhalation or aquatic exposure.
• C. LD50 is the lethal concentration in air; LC50 is the lethal dose via ingestion.
• D. LD50 and LC50 describe the same concept.

Answer: (B)