单选题：Which of the following tells us how caffeine affects sleep?_

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Which of the following tells us how caffeine affects sleep?________________ A．Caffeine blocks production of the enzyme that stops melationin production.
B．Caffeine interrupts the flow of the hormone that prevents people from sleeping.
C．Caffeine halves the body's levels of sleep hormone.
D．Caffeine stays in the body for many hours.

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