Which of the following stages in the life history of liver fluke infects the primary host?
A
Metacercariae
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B
Miracidium
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C
Cercaria
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D
Redia
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Solution
The correct option is D Metacercariae
Platyhelminthes contain worms that cause parasitic and non-parasitic infections in humans and other mammals. Liver fluke is an endoparasite.
The fluke completes its life cycle with the help of two hosts. The primary host is sheep and its secondary or intermediary host is the freshwater snail.
Liver fluke infects the snail at the miracidium stage and sheep at the metacercaria stage. Hence, option A is correct.