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Which phase aims to examine a drug's short-term risks and preliminary effectiveness?

  1. Phase I

  2. Phase II

  3. Phase III

  4. Phase IV

The correct answer is: Phase II

Phase II aims to examine a drug's short-term risks and preliminary effectiveness. During this phase, the drug is tested on a larger group of people, typically 100-300, to gather more data on its safety and effectiveness. Phase II also helps to determine the optimal dosage of the drug. A) Phase I tests a drug on a small group of healthy volunteers and focuses on its safety and potential side effects. C) Phase III tests the drug on a larger group of patients to further evaluate its effectiveness and safety, as well as compare it to current treatments. D) Phase IV, also known as post-marketing surveillance, is conducted after the drug has been approved for use and aims to evaluate long-term side effects and effectiveness. Therefore, none of these phases are focused solely on short-term risks and preliminary effectiveness, making them incorrect options.