This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
The following is true of Giardiasis except ? 
Select and explain. 
A. Complement fixation test is diagnostic, B. Stools contain only cysts, C. Habitat is colon, D. All
D: All
Answer: D: All 
Explanation: 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).