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On the other hand, answering a question in a different language is a clear sign of dementia :)

What if you answered "Si!" but you couldn't read the article?

Not sure about the article, but you wouldn't have demonstrated a good mastery of French (the question wasn't in the negative).

No, you would have demonstrated that you understand French and speak Italian. Or nothing of the sort, as this subthread indicates.

I don't know about you, but I answer "yes" to a lot of questions I don't understand.