question: As shown in the figure, the chord AB of the great circle  is tangent to the small circle, the area of ​​the torus is ()
  Choices:
  A:16m^2
  B:8πm^2
  C:64m^2
  D:16πm^2
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, the chord AB of the great circle  is tangent to the small circle, the area of ​​the torus is ()
  Choices:
  A:16m^2
  B:8πm^2
  C:64m^2
  D:16πm^2
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, the chord AB of the great circle  is tangent to the small circle, the area of ​​the torus is ()
  Choices:
  A:16m^2
  B:8πm^2
  C:64m^2
  D:16πm^2
question_for_eval: As shown in the figure, the chord AB of the great circle  is tangent to the small circle, the area of ​​the torus is ()
  Choices:
  A:16m^2
  B:8πm^2
  C:64m^2
  D:16πm^2