question: Let A B be the median of trapezoid R S T Q. R A equals A Q, and S B equals B T. R S = 54 and Q T = 86. Find A B.
  Choices:
  A:27
  B:54
  C:70
  D:86
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: Let A B be the median of trapezoid R S T Q. R A equals A Q, and S B equals B T. R S = 54 and Q T = 86. Find A B.
  Choices:
  A:27
  B:54
  C:70
  D:86
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: Let A B be the median of trapezoid R S T Q. R A equals A Q, and S B equals B T. R S = 54 and Q T = 86. Find A B.
  Choices:
  A:27
  B:54
  C:70
  D:86
question_for_eval: Let A B be the median of trapezoid R S T Q. R A equals A Q, and S B equals B T. R S = 54 and Q T = 86. Find A B.
  Choices:
  A:27
  B:54
  C:70
  D:86