question: As shown in the figure, passing point C is the tangent of circle O, then the value of OD is ()
  Choices:
  A:1
  B:√{3}
  C:2
  D:2√{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, passing point C is the tangent of circle O, then the value of OD is ()
  Choices:
  A:1
  B:√{3}
  C:2
  D:2√{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, passing point C is the tangent of circle O, then the value of OD is ()
  Choices:
  A:1
  B:√{3}
  C:2
  D:2√{3}
question_for_eval: As shown in the figure, passing point C is the tangent of circle O, then the value of OD is ()
  Choices:
  A:1
  B:√{3}
  C:2
  D:2√{3}