Q: Passage: This article includes lists of supercentenarians from the United States (people from the United States who have attained the age of at least 110 years). The Gerontology Research Group (GRG), an organization that tracks supercentenarians and validates longevity claims, has validated claims of over 700 American supercentenarians and as of 19 April 2018, lists six verified living American supercentenarians, the oldest of whom is Delphine Gibson, born August 17, 1903, aged 114 years, 245 days. The oldest person ever from the United States was Sarah Knauss, who died on December 30, 1999, aged 119 years, 97 days.

Question: Based on this passage, who is the oldest person living in the united states?
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The relevant information is: The Gerontology Research Group (GRG), an organization that tracks supercentenarians and validates longevity claims, has validated claims of over 700 American supercentenarians and as of 19 April 2018, lists six verified living American supercentenarians, the oldest of whom is Delphine Gibson, born August 17, 1903, aged 114 years, 245 days. So the answer is Delphine Gibson.