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 "St. Elizabeths Hospital"): Housing over 8,000 patients at its peak in the 1950s, the hospital at one point had a fully functioning medical-surgical unit, a school of nursing, and accredited internships and psychiatric residencies.
Relevant evidence: No