question: What was the name of the aircraft that crashed into the World Trade Center 's South Tower on September 11 , 2001 ?
answer: United Airlines Flight 175
turker_answer: The name of the aircraft that crashed into the World Trade Center 's South Tower on September 11 , 2001 was United Airlines Flight 175 .
rule-based: The name of the aircraft that crashed into the World Trade Center 's South Tower on September 11 , 2001 was United Airlines Flight 175 .