question: Circle O has a radius of 13 inches, which is the length of O C. Radius O B is perpendicular at point X to chord C D which is 24 inches long. Find O X.
  Choices:
  A:5
  B:12
  C:13
  D:26
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: Circle O has a radius of 13 inches, which is the length of O C. Radius O B is perpendicular at point X to chord C D which is 24 inches long. Find O X.
  Choices:
  A:5
  B:12
  C:13
  D:26
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: Circle O has a radius of 13 inches, which is the length of O C. Radius O B is perpendicular at point X to chord C D which is 24 inches long. Find O X.
  Choices:
  A:5
  B:12
  C:13
  D:26
question_for_eval: Circle O has a radius of 13 inches, which is the length of O C. Radius O B is perpendicular at point X to chord C D which is 24 inches long. Find O X.
  Choices:
  A:5
  B:12
  C:13
  D:26