Question: Which occurred first, St. Elizabeths Hospital being designated a National Historic Landmark or Sibley Memorial Hospital being a part of Johns Hopkins Medicine?
Sentence (from "Johns Hopkins University"): Daniel Coit Gilman, who was inaugurated as the institution's first president on February 22, 1876, led the university to revolutionize higher education in the U.S. by integrating teaching and research.
Relevant evidence: No