This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'The following is true of Giadiasis except - \nSelect and explain. \nA. Complement fixation test is diagnostic, B. Stool contain only cysts, C. Habitat is colon, D. Trophozoites and cysts are found in duodenum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Laboratory diagnosis: Microscopic examination Culture-CPLM Antigen detection-ELISA Molecular methods:nucleic acid hybridization and PCR(refer pgno:34 baveja)', 'role': 'assistant'}]