question: AB=AD, BC=DC, and the length from D to the diagonal intersection point is 5, and the length from C to the diagonal intersection point is 12. Find B C.
  Choices:
  A:5
  B:9
  C:12
  D:13
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: AB=AD, BC=DC, and the length from D to the diagonal intersection point is 5, and the length from C to the diagonal intersection point is 12. Find B C.
  Choices:
  A:5
  B:9
  C:12
  D:13
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: AB=AD, BC=DC, and the length from D to the diagonal intersection point is 5, and the length from C to the diagonal intersection point is 12. Find B C.
  Choices:
  A:5
  B:9
  C:12
  D:13
question_for_eval: AB=AD, BC=DC, and the length from D to the diagonal intersection point is 5, and the length from C to the diagonal intersection point is 12. Find B C.
  Choices:
  A:5
  B:9
  C:12
  D:13