question: Who is responsible for creating Prontosil ?
answer: Josef Klarer , Fritz Mietzsch , and Gerhard Domagk
turker_answer: Josef Klarer , Fritz Mietzsch , and Gerhard Domagk are responsible for creating Prontosil .
rule-based: Josef Klarer , Fritz Mietzsch , and Gerhard Domagk is responsible for creating Prontosil .