This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 2 (Helminthology), Subject name: Microbiology
All are true regarding trematodes except: 
Select and explain. 
A. They are hermaphrodites, B. Usually there are two intermediate hosts, C. Schistosoma hematobium infection is acquired through metacercaria ingestion, D. In Paragoninus westermani the second intermediate host is the crab
C: Schistosoma hematobium infection is acquired through metacercaria ingestion
Answer: C: Schistosoma hematobium infection is acquired through metacercaria ingestion 
Explanation: Trematodes are unsegmented, leaf-like flat worms or helminthes with no body cavity. All of them are hermaphrodite except Schistosoma. They have two intermediate hosts, first is snail and second is fresh-water fish/ crab or water plants except schistosomes (one intermediate host) All schistosomes are acquired by skin penetration by cercariae unlike the other trematodes which are acquired by ingestion of metacercariae in poorly cooked fish or unwashed water plants.