question: As shown in the figure, the straight lines PA and PB are the two tangents of circle O, then the length of chord AB is ()
  Choices:
  A:5
  B:10
  C:10√{3}
  D:5√{3}
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: As shown in the figure, the straight lines PA and PB are the two tangents of circle O, then the length of chord AB is ()
  Choices:
  A:5
  B:10
  C:10√{3}
  D:5√{3}
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: As shown in the figure, the straight lines PA and PB are the two tangents of circle O, then the length of chord AB is ()
  Choices:
  A:5
  B:10
  C:10√{3}
  D:5√{3}
question_for_eval: As shown in the figure, the straight lines PA and PB are the two tangents of circle O, then the length of chord AB is ()
  Choices:
  A:5
  B:10
  C:10√{3}
  D:5√{3}