question: As shown in the figure, chord DE parallel  AB, arc DE is the arc of 50.0, then angle BOC is ()
  Choices:
  A:115°
  B:100°
  C:80°
  D:50°
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, chord DE parallel  AB, arc DE is the arc of 50.0, then angle BOC is ()
  Choices:
  A:115°
  B:100°
  C:80°
  D:50°
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, chord DE parallel  AB, arc DE is the arc of 50.0, then angle BOC is ()
  Choices:
  A:115°
  B:100°
  C:80°
  D:50°
question_for_eval: As shown in the figure, chord DE parallel  AB, arc DE is the arc of 50.0, then angle BOC is ()
  Choices:
  A:115°
  B:100°
  C:80°
  D:50°