Answer A is true: protozoan parasites are, by nature,
single-celled.
Answer C is also true: in addition to the
diarrhea described in the answer, Giardia can cause fever, nausea, swollen abdomen
& abdominal pain and vomiting in its host animal (including
humans!)
Answer D is true as well: the infective form of
Giardia can survive for months in cold water. It is generally 7-14 days from the time
the host is infected to the time symptoms show up, and then the symptoms can last
anywhere from 2-4 weeks. Since Giardia is microscopic, it is very difficult to get rid
of.
That leaves Answer B as the false answer: a sporozite
is the spore formed after the fertilization of an apicomplexan parasite. The active
(infective) stage of protozoan parasites is called trophozoite.
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