Which source is least credible for scientific information?

• A. Peer journal
• B. Online encyclopedia
• C. Random blog post
• D. Textbook

Answer: (C)

In science, credibility comes from evidence, peer review, and verifiable sources. A random blog post usually lacks those checks, often presents opinions as facts, and rarely provides reliable citations or author credentials. Without verification, its claims aren’t trustworthy in the same way as information from more rigorous sources.

Peer journals are strongest because experts in the field review the work before publication, checking methods and results. Textbooks are also reliable since they undergo editorial review and present established knowledge in a clear, curated way. An online encyclopedia can be useful and accurate when it comes from a reputable publisher and includes solid references, but its quality can vary because entries may be created or edited by a range of contributors.

So the random blog post is the least credible source for scientific information.