Do not abandon the answer immediately. Determine whether the interviewer introduced new evidence or is testing your reasoning.

Pressure testing is often about defending a view while staying open-minded and professional.

You can restate the evidence behind your conclusion, acknowledge the strongest weakness, and ask what assumption they want you to revisit if the concern is unclear.

Keep your tone calm, separate tone from evidence, and change your view only when the logic or facts justify it. If useful, this guide on communication under pressure gives more detail.