Hydatid disease of liver is caused by -a) Strongloidesb) Echinococcus granulosusc) Taenia soliumd) Trichinella spiralise) Echinococcus multilocularis
Hydatid disease:

Echinococcus granulosus: Causes Hydatid disease—Hepatomegaly (60—70% of cases), then lungs
E. multilocularis: Causes Alveolar Hydatid disease (90%-liver involvement)
E. oligarthrus and E.vogeli: Causes Polycystic Hydatid disease.
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