This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
True about trematodes 
Select and explain. 
A. Two host required, B. Segmented, C. Anus present, D. Body cavity present
A: Two host required
Answer: A: Two host required 
Explanation: Medically important member of the class Trematoda belongs to subclass Digenea, as they are digenetic, i.e., require two hosts. The definitive host in which they pass the sexual or adult stage are mammals, humans or animals, and the intermediate hosts in which they pass their asexual or larval stages are freshwater mollusks or snails.
Trematodes are unsegmented and have no anus and body cavity.