question: In isosceles triangle R S T, find m \angle R S T.
  Choices:
  A:55
  B:70
  C:75
  D:80
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: In isosceles triangle R S T, find m \angle R S T.
  Choices:
  A:55
  B:70
  C:75
  D:80
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: In isosceles triangle R S T, find m \angle R S T.
  Choices:
  A:55
  B:70
  C:75
  D:80
question_for_eval: In isosceles triangle R S T, find m \angle R S T.
  Choices:
  A:55
  B:70
  C:75
  D:80