A) Sporozoa - Infection by sporozoites, transmision by intermediate host and a contractile vacuole
B) Trematoda - Well developed suckers, flat unsegmented body
C) Arachnida - 3 pairs of legs, chitinous exoskeleton and poisonous sting
D) Insecta - Compound eyes, segmented body and nephridia
Correct Answer: B
Solution :
Trematodes commonly called flukes, ecto or endoparasites, body without cilia, body unsegmented with suckers and sometimes hooks present.
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