question: As shown in the figure, the central angles of chords AB and CD are angle AOB, angle COD, and angle AOB is complementary to angle COD, then the length of chord AB is ()
  Choices:
  A:6
  B:8
  C:5√{2}
  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 central angles of chords AB and CD are angle AOB, angle COD, and angle AOB is complementary to angle COD, then the length of chord AB is ()
  Choices:
  A:6
  B:8
  C:5√{2}
  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 central angles of chords AB and CD are angle AOB, angle COD, and angle AOB is complementary to angle COD, then the length of chord AB is ()
  Choices:
  A:6
  B:8
  C:5√{2}
  D:5√{3}
question_for_eval: As shown in the figure, the central angles of chords AB and CD are angle AOB, angle COD, and angle AOB is complementary to angle COD, then the length of chord AB is ()
  Choices:
  A:6
  B:8
  C:5√{2}
  D:5√{3}