<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A new treatment for hemorrhagic stroke, which is a life-threatening clinical condition that occurs when a diseased blood vessel in the brain ruptures or leaks, was evaluated as soon as it hit the market by an international group of neurology specialists. In those treated with the new drug, a good outcome was achieved in 30, while those treated with the current standard of care had a good outcome in just 10 of cases. The clinicians involved in this cohort study concluded that the newer drug is more effective and prompted for urgent changes in the guidelines addressing hemorrhagic stroke incidents. According to the aforementioned percentages, how many patients must be treated with the new drug to see 1 additional good outcome?? A: 5, B: 10, C: 15, D: 20, E: 30,  <response>: This is a question testing the ability to calculate the number needed to treat NNT based on the provided percentages of good outcomes for the new drug 30 versus the standard treatment 10. To calculate the NNT, we take the inverse of the absolute risk reduction. The absolute risk reduction is the difference between the response rates - here, it is 30 - 10 20. The inverse of 20 is 10.2 5. So the NNT is 5.A: 5 