【单选题】【消耗次数：1】
下列有关乳果糖的作用说法中，错误的是（ ）
①
小肠中不存在分解乳果糖的酶，因此乳果糖可完整到达大肠
②
乳果糖被肠道细菌分解为乳酸和醋酸等，使肠道pH值降低
③
乳果糖通过增加肠道渗透压而软化大便、降低肠道pH值从而加快肠蠕动，故具有自然导泻作用
④
乳果糖吸收肠道内大便水分，防止腹泻
⑤
以上说法均不正确
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