Parasite causing biliary tract obstruction -: (A) Ascaris, (B) Trichinella, (C) Taenia solium, (D) All of the above
Answer is A. Ans. is 'a' i.e., Ascaris * Infection of the biliary tract by adult helminths or their ova produces a chronic recurrent pyogenic cholangitis with or without multiple hepatic abscesses, ductal stones or biliary obstruction. The most commonly involved organisms are -# Clonorchis sinensis# lntrabiliary rupture of hydatid cysts of Echinococcus sp.# Intraductal migration of adult Ascaris lumbricoides.# Opisthorchis viverrini or O. felineus# Fasciola hepatica