The least reliable source of information is a medical blog because the information available on a medical blog may not have been vetted by experts.
Reliability of information
For an information to be regarded as reliable and authentic, we must critically consider the source of the information. As a rule of thumb, the source determines the credibility of the information.
Looking at the options presented, we know that the information available on a medical blog may not have been vetted by experts hence the least reliable source of information is a medical blog.
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