def extract_answer(pred: str) -> str:
    start_tag = "<answer>"
    end_tag = "</answer>"
    last_start_index = pred.rfind(start_tag)
    last_end_index = pred.rfind(end_tag)
    if last_start_index == -1 or last_end_index == -1 or last_start_index > last_end_index:
        return pred
    else:
        return pred[last_start_index + len(start_tag):last_end_index].strip()