class_docstr: Tests for math_qa dataset.
code: def test_extract_answer_text(self, options_text):
      self.assertEqual(
          math_qa_dataset_builder.extract_answer_text(
              options_text, "a"
          ),
          "1 , 2",
      )
      self.assertEqual(
          math_qa_dataset_builder.extract_answer_text(
              options_text, "b"
          ),
          "3",
      )
      self.assertEqual(
          math_qa_dataset_builder.extract_answer_text(
              options_text, "c"
          ),
          "none of these",
      )
  
imports: from absl.testing import parameterized
  from tensorflow_datasets.datasets.math_qa import math_qa_dataset_builder
  import tensorflow_datasets.public_api
label_desc: Use image node_id 1 for calling the MathQaTest obj's underlying member method code with example usage: obj.test_extract_answer_text(options_text) without return types