77.下列何種細菌最常引起胃炎和胃潰瘍? (A)傷寒桿菌(Salmonella Typhi) (B)小腸結腸炎耶爾森氏菌(Yersinia enterocolitica) (C)空腸曲狀桿菌(Campylobacter jejuni) (D)幽門螺旋桿菌(Helicobacter pylori)