The following is true of Giardiasis except ?

Ans. is 'a' i.e., Complement fixation test is diagnostic; 'b' i.e., Stools contain only cysts; `c' i.e., Habitat is colon . Amongst the given option, only option 'd' is true i.e., trophozoites and cysts are found in duodenum. About other options . The gold - standard for diagnosis of giardiasis is microscopic demonstration of the trophozoite, cyst or both in feces (not C.F.T.). . Stools contain both cyst and trophozoite. . The normal habitat is duodenum and upper jejunum (not colon).