A nurse is caring for a client who is newly diagnosed with pancreatic cancer and has questions about the disease. To research the disease, the nurse should identify which of the following electronic databases has the most comprehensive collection of nursing journal articles?

A. Cumulative Index to Nursing and Allied Health Literature (CINAHL) is the most comprehensive nursing-specific electronic database, providing access to peer-reviewed nursing and allied health journals, evidence-based care sheets, research studies, and continuing education materials. It is the preferred source for nursing research and scholarly articles. B. Agency for Healthcare Research and Quality (AHRQ) focuses on healthcare quality, safety, and outcomes but is not primarily a journal database; it provides guidelines and reports rather than comprehensive journal access. C. Health Source offers general health-related articles, often intended for consumers or interdisciplinary audiences, but it lacks the depth and nursing focus found in CINAHL. D. ProQuest is a large academic database that includes many disciplines; however, it is not as specific or detailed in nursing and allied health research as CINAHL.