Chinese Brainteaser

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Yígè jǐngchá yǒu gè dìdi,  dàn dìdi què fǒurèn yǒu gè gēge, wèishénme? 一个  警察     有   个 弟弟， 但 弟弟  却  否认    有   个  哥哥， 为什么？ A cop has a younger brother, but the younger brother denies that he has an elder brother. Why is …