question: There are 4 labels on the x-axis $-\pi$, $-\frac{2}{\pi}$, $\frac{2}{\pi}$, $\pi$ and a curve that goes through ($\frac{2}{\pi}$,0). Determine if this relation is a one-to-one function.
  Choices:
  A:This is a one-to-one function
  B:This is not a one-to-one function
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: There are 4 labels on the x-axis $-\pi$, $-\frac{2}{\pi}$, $\frac{2}{\pi}$, $\pi$ and a curve that goes through ($\frac{2}{\pi}$,0). Determine if this relation is a one-to-one function.
  Choices:
  A:This is a one-to-one function
  B:This is not a one-to-one function
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: There are 4 labels on the x-axis $-\pi$, $-\frac{2}{\pi}$, $\frac{2}{\pi}$, $\pi$ and a curve that goes through ($\frac{2}{\pi}$,0). Determine if this relation is a one-to-one function.
  Choices:
  A:This is a one-to-one function
  B:This is not a one-to-one function
question_for_eval: There are 4 labels on the x-axis $-\pi$, $-\frac{2}{\pi}$, $\frac{2}{\pi}$, $\pi$ and a curve that goes through ($\frac{2}{\pi}$,0). Determine if this relation is a one-to-one function.
  Choices:
  A:This is a one-to-one function
  B:This is not a one-to-one function