Which of the Following Statements Regarding Schistosomiasis Is Incorrect

Which of the following statements regarding schistosomiasis is incorrect?

A) Schistosomiasis is transmitted by exposing the skin to a water source that has been contaminated with sewage.
B) There is only a single drug available to treat Schistosoma infection, praziquantel, and drug- resistant strains are beginning to arise.
C) Efficacy of treatment is assess by observing fecal samples placed in water for whether eggs can hatch to release live miracidia.
D) Once a person has recovered from an infection with Schistosoma mansoni, they are protected with lifelong immunity.