question: How would you describe the rate of increase of $y=4^{x}$ ?
  Choices:
  A.$y$ is increasing at a constant rate
  B.$y$ is increasing at a decreasing rate
  C.$y$ is increasing at an increasing rate
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: How would you describe the rate of increase of $y=4^{x}$ ?
  Choices:
  A.$y$ is increasing at a constant rate
  B.$y$ is increasing at a decreasing rate
  C.$y$ is increasing at an increasing rate
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: How would you describe the rate of increase of $y=4^{x}$ ?
  Choices:
  A.$y$ is increasing at a constant rate
  B.$y$ is increasing at a decreasing rate
  C.$y$ is increasing at an increasing rate
question_for_eval: How would you describe the rate of increase of $y=4^{x}$ ?
  Choices:
  A.$y$ is increasing at a constant rate
  B.$y$ is increasing at a decreasing rate
  C.$y$ is increasing at an increasing rate