根据以下材料，回答 It′soneofourcommonbeliefsthatmiceareafraidofcats.Scientistshavelongknownthatevenifamousehasneverseenacatbefore,itisstillabletodetectchemicalsignalsreleasedfromitandrunawayinfear.Thishasalwaysbeenthoughttobesomethingthatishard-wiredintoamouse′sbrain. ButnowWendyIngram,agraduatestudentattheUniversityofCalifornia,Berkeley,haschallengedthiscommonsense.Shehasfoundawayto"cure"miceoftheirinbornfearofcatsbyinfectingthemwithaparasite,reportedthesciencejournalNature. Theparasite,calledToxoplasmagondii,mightsoundunfamiliartoyou,buttheshockingfactisthatuptoone-thirdofpeoplearoundtheworldareinfectedbyit.Thisparasitecancausedifferentdiseasesamonghumans,especiallypregnantwomen--itislinkedtoblindnessandthedeathofunbornbabies. However,theparasite′seffectsonmiceareunique,Ingramandherteammeasuredhowmicereactedtoacat′surine(尿)beforeandafteritwasinfectedbytheparasite.Theynotedthatnormalmicestayedfarawayfromtheurinewhilemicethatwereinfectedwiththeparasitewalkedfreelyaroundthetestarea. Butthat′snotall.Theparasitewasfoundtobemorepowerfulthanoriginallythought--evenafterresearcherscuredthemiceoftheinfection.Theynolongerreactedwithfeartoacat′ssmell,whichcouldindicatethattheinfectionhascausedapermanentchangeinmice′sbrains. Whydoesaparasitechangeamouse′sbraininsteadofmakingitsicklikeitdoestohumans?Theanswerliesinevolution. "It′sexcitingscarytoknowhowaparasitecanmanipulateamouse′sbrainthisway,"Ingramsaid.Butshealsofindsitinspiring."Typicallyifyouhaveabacterialinfection,yougotoadoctorandtakeantibioticsandtheinfectionisclearedandyouexpectallthesymptomstoalsogoaway."Shesaid,butthisstudyhasproventhatwrong."Thismayhavehugeimplicationsforinfectiousdiseasemedicine." Thepassageismainlyabout____________.
A.mice's inborn terror of cats B.the evolution of Toxoplasma C.a new study about the effects of aparasite on mice D.a harmful parasite called Toxoplasmagondii正确答案C
