def llm_answer_with_evidence(question, filtered_text_prompt):
    resp = client.responses.parse(
        model=model_chat,
        input=[
            {
                "role": "system",
                "content": (
                    "Answer using ONLY the provided lines. "
                    "Return JSON only."
                ),
            },
            {
                "role": "user",
                "content": (
                    f"Lines:\n{filtered_text_prompt}\n\n"
                    f"Question:\n{question}\n\n"
                    "Pick a contiguous evidence span."
                ),
            },
        ],
        text_format=AnswerWithEvidence,
        store=False,
    )
    return resp.output_text