Situation: You were talking about Maria with someone and you hear somebody approaching. Ask your interlocutor if the person who is coming is Maria.
Interpretation of the utterance: Yes-no question with narrow focus and emphasis
Informator: J. S.
Utterance: Siriá pas la Maria, par azard?
Translation: Wouldn't it be Maria, by chance? [Be(conditional, 3rd sing.) not the Maria, by chance?]