The correct answer to this question is: opinion.
An opinion can be defined as the ideas, perception or viewpoint representing and describing what a person think or feel about an issue, topic, subject, event, etc.
Hence, a statement such as "Eating fast food isn't bad, if you only eat it once a week." is considered to be an opinion because it is not backed up by any empirical evidence.
On the other hand, a fact is an evidential information provided about a specific event, topic, or subject matter in its actual and true conditions. Thus, a fact clearly and concisely presents the fundamental reality of a thing (subject) based on an empirical study and/or objective consensus.
For example, saying that "There are seven (7) days in a week." is a fact because it can be proven beyond reasonable doubt.
In conclusion, an example of an opinion is saying; Eating fast food isn't bad, if you only eat it once a week.
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