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以下は、MeSH(Medical Subject Headings)に関する文章である。空欄(D)にあてはまる最も適切な単語を解答群から選択し、その番号を解答欄に記入しなさい。
Descriptors: Also known as Main Headings, Descriptors are used to index (D) in NLM's MEDLINE database, for cataloging of publications, and other databases, and are searchable in PubMed as [MH]. Most Descriptors indicate the subject of an indexed item, such as a journal article, that is, what the article is about. The descriptors or subject headings are arranged in a hierarchy. A given descriptor may appear at several locations in the hierarchical tree. The tree locations carry systematic labels known as (E), and consequently one descriptor can carry several (E).

  1. controlled
  2. integrated
  3. field
  4. citations
  5. indexing