單項(xiàng)選擇題患者,男,35歲。脘腹脹滿,不思飲食,惡心嘔吐,疲乏無力,大便溏泄,日行3~4次,舌質(zhì)淡,苔白濁而膩,脈象濡滑。用藥宜首選()

A.白術(shù)
B.蒼術(shù)
C.白芍
D.黨參
E.炙黃芪