Context: The thalidomide tragedy resurrected Kefauver's bill to enhance drug regulation that had stalled in Congress, and the Kefauver-Harris Amendment became law on 10 October 1962. Manufacturers henceforth had to prove to FDA that their drugs were effective as well as safe before they could go on the US market. The FDA received authority to regulate advertising of prescription drugs and to establish good manufacturing practices. The law required that all drugs introduced between 1938 and 1962 had to be effective. An FDA - National Academy of Sciences collaborative study showed that nearly 40 percent of these products were not effective. A similarly comprehensive study of over-the-counter products began ten years later.

Question: When did the Kefauver-Harris Amendment become a law?
Answer: 10 October 1962

Question: What did this new law require?
Answer: all drugs introduced between 1938 and 1962 had to be effective

Question: What did the National Academy of Science's study discover?
Answer: nearly 40 percent of these products were not effective

Question: How long after the National Academy of Science's study did a study on over the counter drugs occur?
Answer: ten years later

Question: What brought up enhancement of drug regulations?
Answer: The thalidomide tragedy

Question: When did the Kefauver-Harris Amendment became law?
Answer: 10 October 1962

Question: What federal agency regulated the advertising of prescription drugs?
Answer: FDA

Question: Drugs made between which years had to be tested before going to market?
Answer: 1938 and 1962

Question: What percentage of drugs were shown to be ineffective after an FDA study?
Answer: 40 percent

Question: When did the FDA Amendment become a law?
Answer: Unanswerable

Question: What did this new law prohibit?
Answer: Unanswerable

Question: What did the FDA study discover?
Answer: Unanswerable

Question: How long after the FDA's study did a study on over the counter drugs occur?
Answer: Unanswerable

Question: What brought up enhancement of Congress regulations?
Answer: Unanswerable