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A classic example of argument from unqualified authority is a reference to a celebrity or religious leader for their opinion on a matter of science or public policy, when that celebrity or cleric has never adequately studied the subject. A standard argument from authority is often used by evolutionists. A notable scientist claims that evolution is true, and based on that the average person is expected to believe in it as well. This becomes fallacious if the "notable scientist" has never considered alternatives which also provide the answers to the asked questions.