question: Find m \angle 2 if m \widehat B C = 30 and m \widehat A D = 20.
  Choices:
  A:20
  B:25
  C:30
  D:155
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: Find m \angle 2 if m \widehat B C = 30 and m \widehat A D = 20.
  Choices:
  A:20
  B:25
  C:30
  D:155
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: Find m \angle 2 if m \widehat B C = 30 and m \widehat A D = 20.
  Choices:
  A:20
  B:25
  C:30
  D:155
question_for_eval: Find m \angle 2 if m \widehat B C = 30 and m \widehat A D = 20.
  Choices:
  A:20
  B:25
  C:30
  D:155