Ment
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Cop, what doubts can there be?
I'm proceeding from the assumption that all Mafia and Villagers are not the City and are immune to infection.
Clara is also definitely immune, so with the third question, we separate her from the rest of the "bad guys."
At the same time, the poll finds a Villager. Because for him, the answer to the third question is true, and, of course, we tell all the Villagers to lie in the answer to the third question. That is, we directly tell them, in bold and larger font. We don't guess what options there are, but clearly tell the Villagers to only lie in the third question.
That is, all Villagers except Clara answer yes, yes, yes*.
Clara: yes, yes, no*.
The Villager can answer:
Yes* no, yes, no Yes* yes, no, no no*
The Mafia can answer:
Yes* no, no, no yes* no, no no no*
Essentially, this is a precise distinction between City and not City. The Mafia can reveal themselves as Mafia or pretend to be a Villager; obviously, they will choose the latter.
The Villager can reveal themselves as a Villager or maintain the ambiguity of Villager/Mafia, although the Mafia will still find out the truth.