code: def _get_answer_spans(answer_list, answer_start_list):
          
          return [(answer_start_list[i], answer_start_list[i] + len(answer))
                  for i, answer in enumerate(answer_list)]
docs: Find all answer spans from the context, returning start_index and end_index
  
          :param list[str] answer_list: List of all answers
          :param list[int] answer_start_list: List of all answers' start indices
  
          Returns
          -------
          List[Tuple]
              list of Tuple(answer_start_index answer_end_index) per question