question: In the figure above, the length of CD is 7, the length of CF is 15, and CDEF is a rectangle. If the area of triangle CAF is equal to the area of rectangle CDEF, what is the length of segment AD?
  Choices:
  A.7/2
  B.5
  C.7
  D.15/2
  E.15
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: In the figure above, the length of CD is 7, the length of CF is 15, and CDEF is a rectangle. If the area of triangle CAF is equal to the area of rectangle CDEF, what is the length of segment AD?
  Choices:
  A.7/2
  B.5
  C.7
  D.15/2
  E.15
query_cot: Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: In the figure above, the length of CD is 7, the length of CF is 15, and CDEF is a rectangle. If the area of triangle CAF is equal to the area of rectangle CDEF, what is the length of segment AD?
  Choices:
  A.7/2
  B.5
  C.7
  D.15/2
  E.15
question_for_eval: In the figure above, the length of CD is 7, the length of CF is 15, and CDEF is a rectangle. If the area of triangle CAF is equal to the area of rectangle CDEF, what is the length of segment AD?
  Choices:
  A.7/2
  B.5
  C.7
  D.15/2
  E.15