Mouth cancer is a danger for people who rarely brush their teeth. In order to achieve early detection of mouth cancer in these individuals, a town's public health officials sent a pamphlet to all town residents, describing how to perform weekly self-examinations of the mouth for lumps.
Which of the following, if true, is the best criticism of the pamphlet as a method of achieving the public health officials' goal?
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AMany dental diseases produce symptoms that cannot be detected in a weekly self-examination.
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BOnce mouth cancer has been detected, the effectiveness of treatment can vary from person to person.
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CThe pamphlet was sent to all town residents, including those individuals who brush their teeth regularly.
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DMouth cancer is much more common in adults than in children.
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EPeople who rarely brush their teeth are unlikely to perform a weekly examination of their mouth.
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正确答案: E