question: Where is there a giant letter A on a Tucson mountain ?
answer: On Sentinel Peak ( also known as '' ` A ' Mountain '' ) , just west of downtown
turker_answer: There is a giant letter A on Sentinel Peak ( also known as '' ` A ' Mountain '' ) , a mountain just west of downtown Tucson .
rule-based: Is there a giant letter A on a Tucson mountain on Sentinel Peak ( also known as '' ` A ' Mountain '' ) , just west of downtown .