The infective stage of Fasciola hepatica for primary host is
A
Redia
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B
Metacercaria
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C
Sporocyst
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D
Miracidium
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Solution
The correct option is B Metacercaria Fasciola hepatica is a parasitic trematode that infects the livers of various mammals, including humans. The liver fluke first infects an intermediate host called the mud snail. The infective stage of the parasite, in this case, is the Redia. Mammals that are the primary host often acquire the parasite through eating the parasite's metacercariae encysted on plants. So, the correct option is 'Metacercaria'.