单选题：What does the experiment mentioned in paragraph 4 prove?____

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题目类型：单选题
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题目内容：

What does the experiment mentioned in paragraph 4 prove?________________ A．There are more enzymes in decal drinkers' urine sample.
B．there are more melatonin concentrations in caffeine drinkers' urine sample.
C．Decal drinkers produce less melationin.
D．Caffeine drinkers produce less sleep hormone.

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