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当前学科：突发公共卫生事件应急处理
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在食品安全事故调查过程中，如致病因子未知而流行曲线提示为点源暴露时，可根据发病时间的中位数向前推多长时间，可估算可能暴露时间？（）
A . 1个平均潜伏期
B . 1.5个平均潜伏期
C . 2个最短潜伏期
D . 1个最长潜伏期
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