There is another possibility. “Source?” is a low effort comment, but GP’s is not.

I appreciate you taking the time to share your perspective. Your comment raises an interesting point, and I would genuinely like to understand it more thoroughly.

Would you mind clarifying what source or reference you are relying on for that statement? I am asking in the spirit of constructive dialogue, not to challenge you, but to better understand the foundation of your view. If there is a specific study, report, dataset, or publication that informed your conclusion, I would be grateful if you could point me toward it.

Having access to the underlying source would help ensure that the discussion remains grounded in verifiable information and would allow others, including myself, to review the context and methodology behind the claim. That, in turn, would make the exchange more substantive and productive.

Thank you in advance for any clarification you can provide.