Which database is a free, credible search engine maintained by the U.S. National Library of Medicine and provides access to millions of citations and abstracts for biomedical literature?

• A. PubMed
• B. Google Scholar
• C. Web of Science
• D. Scopus

Answer: (A)

In biomedical research and clinical practice, a free, credible place to search for literature is essential. PubMed fits this need because it is a free search tool maintained by the U.S. National Library of Medicine. It provides access to millions of citations and abstracts for biomedical literature, drawing from MEDLINE and other life-science journals. While you can often link out to full text via publishers or PubMed Central, the search itself is freely accessible and widely trusted in the healthcare community.

Compared with other options, PubMed stands out for its government-backed reliability and its strong biomedical focus. Google Scholar is free and broad but not curated specifically for biomedical sources, so it can return a mix of peer-reviewed and non-peer-reviewed items. Web of Science and Scopus are excellent for comprehensive indexing and citation analysis, but they require subscriptions and aren’t maintained by the National Library of Medicine.