题目内容：
The scientists from the Johns Hopkins University said that C75, the slimming drug proved effective in mice, is likely to work on humans because __________.
A．the chemical pathway responsible for appetite control in human is believed to be the same as that in mice B．it is a major pathway in the brain which is activated to regulate appetite
C．it is especially effective in the battle against obesity
D．its effect has also been proved by human studies
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