<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_answer_spans(answer_list, answer_start_list):
 """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 """

        return [(answer_start_list[i], answer_start_list[i] + len(answer))
                for i, answer in enumerate(answer_list)]