question: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
  Choices:
  A:9
  B:10
  C:11
  D:12
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
  Choices:
  A:9
  B:10
  C:11
  D:12
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: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
  Choices:
  A:9
  B:10
  C:11
  D:12
question_for_eval: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
  Choices:
  A:9
  B:10
  C:11
  D:12