This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
Chagas disease is caused by? 
Select and explain. 
A. Trypanosoma cruzi, B. Trypanosoma gamb, C. Trypanosoma brucei, D. Leishmania donova
A: Trypanosoma cruzi
Answer: A: Trypanosoma cruzi 
Explanation: ANSWER: (A) Trypanosoma cruziREF: Paniker 6th ed p. 42-43Although the genus Trypanosoma contains many species of protozoans, only T. cruzit T. brucei gamhiense, and T. brucei rhodesiense cause disease in humans. T. cruzi is the etiologic agent of Chagas' disease in the Americas; T. b. gamhiense and T. b. rhodesiense cause African trypanosomiasisTrypanosomeVectorDiseaseInfective stageT.bruceiTse tse flyAfrican trypanosomiasis sleeping sicknessMetacyclic trypomastigoteT. cruziReduvid bugChagas disease (south american trypanosomiasis)Metacyclic trypomastigote