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How long does the development of most new drugs from discovery to marketing approval usually take?

  1. Less than 5 years

  2. 5 to 8 years

  3. 9 years or more

  4. Exactly 10 years

The correct answer is: 9 years or more

The development of most new drugs from discovery to marketing approval usually takes longer than 9 years. While it is possible for some drugs to take less than 5 years or between 5 to 8 years, these are not common timelines. The process of discovering, testing, and gaining approval for a new drug typically involves ample research and thorough testing, which can take several years to complete. It is also not accurate to say that the process takes exactly 10 years, as timelines can vary depending on the drug and its specific development process. Therefore, option C is the best choice as it covers the most likely and common timeline for drug development.