question: In the figure above, the smaller circles are tangent to the larger circle at points A and C, and are tangent to each other at point B. What is the perimeter of the shaded region?
  Choices:
  A.6*\pi
  B.8*\pi
  C.9*\pi
  D.12*\pi
  E.15*\pi
  
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: In the figure above, the smaller circles are tangent to the larger circle at points A and C, and are tangent to each other at point B. What is the perimeter of the shaded region?
  Choices:
  A.6*\pi
  B.8*\pi
  C.9*\pi
  D.12*\pi
  E.15*\pi
  
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 the figure above, the smaller circles are tangent to the larger circle at points A and C, and are tangent to each other at point B. What is the perimeter of the shaded region?
  Choices:
  A.6*\pi
  B.8*\pi
  C.9*\pi
  D.12*\pi
  E.15*\pi
  
question_for_eval: In the figure above, the smaller circles are tangent to the larger circle at points A and C, and are tangent to each other at point B. What is the perimeter of the shaded region?
  Choices:
  A.6*\pi
  B.8*\pi
  C.9*\pi
  D.12*\pi
  E.15*\pi
  